[syzbot] [bluetooth?] KASAN: slab-use-after-free Read in mgmt_remove_adv_monitor_complete (3)

[syzbot] [bluetooth?] KASAN: slab-use-after-free Read in mgmt_remove_adv_monitor_complete (3)

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    ea34704d6ad7 Merge tag 'drm-fixes-2025-05-10' of https://g..
git tree:       upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1663acf4580000
kernel config:  https://syzkaller.appspot.com/x/.config?x=91c351a0f6229e67
dashboard link: https://syzkaller.appspot.com/bug?extid=feb0dc579bbe30a13190
compiler:       Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=112c9768580000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1526e670580000

Downloadable assets:
disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/d900f083ada3/non_bootable_disk-ea34704d.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/c7e586f1a091/vmlinux-ea34704d.xz
kernel image: https://storage.googleapis.com/syzbot-assets/cd61ffd40938/bzImage-ea34704d.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+feb0dc579bbe30a13190@syzkaller.appspotmail.com

==================================================================
BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
Read of size 8 at addr ffff888048891a18 by task kworker/u5:8/5333

CPU: 0 UID: 0 PID: 5333 Comm: kworker/u5:8 Not tainted 6.15.0-rc5-syzkaller-00197-gea34704d6ad7 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: hci0 hci_cmd_sync_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
 print_address_description mm/kasan/report.c:408 [inline]
 print_report+0xb4/0x290 mm/kasan/report.c:521
 kasan_report+0x118/0x150 mm/kasan/report.c:634
 mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
 hci_cmd_sync_work+0x25e/0x3a0 net/bluetooth/hci_sync.c:334
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:464
 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

Allocated by task 5702:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
 kmalloc_noprof include/linux/slab.h:905 [inline]
 kzalloc_noprof include/linux/slab.h:1039 [inline]
 mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252
 mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279
 remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5453
 hci_mgmt_cmd+0x9c6/0xef0 net/bluetooth/hci_sock.c:1712
 hci_sock_sendmsg+0x6ca/0xee0 net/bluetooth/hci_sock.c:1832
 sock_sendmsg_nosec net/socket.c:712 [inline]
 __sock_sendmsg+0x219/0x270 net/socket.c:727
 sock_write_iter+0x258/0x330 net/socket.c:1131
 new_sync_write fs/read_write.c:591 [inline]
 vfs_write+0x548/0xa90 fs/read_write.c:684
 ksys_write+0x145/0x250 fs/read_write.c:736
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

Freed by task 5700:
 kasan_save_stack mm/kasan/common.c:47 [inline]
 kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
 poison_slab_object mm/kasan/common.c:247 [inline]
 __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
 kasan_slab_free include/linux/kasan.h:233 [inline]
 slab_free_hook mm/slub.c:2380 [inline]
 slab_free mm/slub.c:4642 [inline]
 kfree+0x193/0x440 mm/slub.c:4841
 mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242
 mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9362
 hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1307
 __sys_bind_socket net/socket.c:1810 [inline]
 __sys_bind+0x2c3/0x3e0 net/socket.c:1841
 __do_sys_bind net/socket.c:1846 [inline]
 __se_sys_bind net/socket.c:1844 [inline]
 __x64_sys_bind+0x7a/0x90 net/socket.c:1844
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

The buggy address belongs to the object at ffff888048891a00
 which belongs to the cache kmalloc-96 of size 96
The buggy address is located 24 bytes inside of
 freed 96-byte region [ffff888048891a00, ffff888048891a60)

The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x48891
flags: 0x4fff00000000000(node=1|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 04fff00000000000 ffff88801a041280 ffffea0000d6e3c0 dead000000000008
raw: 0000000000000000 0000000080200020 00000000f5000000 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 0, migratetype Unmovable, gfp_mask 0x252800(GFP_NOWAIT|__GFP_NORETRY|__GFP_COMP|__GFP_THISNODE), pid 5317, tgid 5317 (syz-executor420), ts 80512529929, free_ts 0
 set_page_owner include/linux/page_owner.h:32 [inline]
 post_alloc_hook+0x1d8/0x230 mm/page_alloc.c:1718
 prep_new_page mm/page_alloc.c:1726 [inline]
 get_page_from_freelist+0x21ce/0x22b0 mm/page_alloc.c:3688
 __alloc_frozen_pages_noprof+0x181/0x370 mm/page_alloc.c:4970
 alloc_slab_page mm/slub.c:2452 [inline]
 allocate_slab+0x65/0x3b0 mm/slub.c:2618
 new_slab mm/slub.c:2672 [inline]
 ___slab_alloc+0xbfc/0x1480 mm/slub.c:3858
 __slab_alloc mm/slub.c:3948 [inline]
 __slab_alloc_node mm/slub.c:4023 [inline]
 slab_alloc_node mm/slub.c:4184 [inline]
 __kmalloc_cache_node_noprof+0x29a/0x3d0 mm/slub.c:4366
 kmalloc_node_noprof include/linux/slab.h:928 [inline]
 alloc_node_nr_active kernel/workqueue.c:4872 [inline]
 __alloc_workqueue+0x6a4/0x1b70 kernel/workqueue.c:5726
 alloc_workqueue+0xd4/0x210 kernel/workqueue.c:5786
 tipc_topsrv_work_start net/tipc/topsrv.c:635 [inline]
 tipc_topsrv_start net/tipc/topsrv.c:679 [inline]
 tipc_topsrv_init_net+0x37f/0x830 net/tipc/topsrv.c:725
 ops_init+0x359/0x5c0 net/core/net_namespace.c:138
 setup_net+0x238/0x830 net/core/net_namespace.c:364
 copy_net_ns+0x32e/0x590 net/core/net_namespace.c:518
 create_new_namespaces+0x3d3/0x700 kernel/nsproxy.c:110
 unshare_nsproxy_namespaces+0x11c/0x170 kernel/nsproxy.c:228
 ksys_unshare+0x4c8/0x8c0 kernel/fork.c:3375
 __do_sys_unshare kernel/fork.c:3446 [inline]
 __se_sys_unshare kernel/fork.c:3444 [inline]
 __x64_sys_unshare+0x38/0x50 kernel/fork.c:3444
page_owner free stack trace missing

Memory state around the buggy address:
 ffff888048891900: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888048891980: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
>ffff888048891a00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
                            ^
 ffff888048891a80: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
 ffff888048891b00: fa fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc
==================================================================


---
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Re: [syzbot] #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9f35e33144ae5377d6a8de86dd3bd4d995c6ac65

[syzbot]

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***

Subject: #syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9f35e33144ae5377d6a8de86dd3bd4d995c6ac65
Author: dmantipov@yandex.ru

#syz test: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9f35e33144ae5377d6a8de86dd3bd4d995c6ac65

Re: [syzbot] #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a5806cd506af5a7c19bcd596e4708b5c464bfd21

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Subject: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a5806cd506af5a7c19bcd596e4708b5c464bfd21
Author: dmantipov@yandex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git a5806cd506af5a7c19bcd596e4708b5c464bfd21

Re: [syzbot] #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac

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Subject: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac
Author: dmantipov@yandex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac

Re: [syzbot] #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac

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Subject: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac
Author: dmantipov@yandex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac

Re: [syzbot] Re: [PATCH v1] Bluetooth: MGMT: Use RCU-protected in mgmt_pending list

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Subject: Re: [PATCH v1] Bluetooth: MGMT: Use RCU-protected in mgmt_pending list
Author: luiz.dentz@gmail.com

#syz test

On Wed, May 28, 2025 at 2:44 PM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
>
> This uses RCU procedures to protect from concurrent access of
> mgmt_pending list which can cause crashes like:
>
> ==================================================================
> BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
> Read of size 8 at addr ffff888048891a18 by task kworker/u5:8/5333
>
> CPU: 0 UID: 0 PID: 5333 Comm: kworker/u5:8 Not tainted 6.15.0-rc5-syzkaller-00197-gea34704d6ad7 #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> Workqueue: hci0 hci_cmd_sync_work
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
>  print_address_description mm/kasan/report.c:408 [inline]
>  print_report+0xb4/0x290 mm/kasan/report.c:521
>  kasan_report+0x118/0x150 mm/kasan/report.c:634
>  mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
>  hci_cmd_sync_work+0x25e/0x3a0 net/bluetooth/hci_sync.c:334
>  process_one_work kernel/workqueue.c:3238 [inline]
>  process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
>  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
>  kthread+0x70e/0x8a0 kernel/kthread.c:464
>  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
>
> Allocated by task 5702:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
>  poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>  __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
>  kasan_kmalloc include/linux/kasan.h:260 [inline]
>  __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
>  kmalloc_noprof include/linux/slab.h:905 [inline]
>  kzalloc_noprof include/linux/slab.h:1039 [inline]
>  mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252
>  mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279
>  remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5453
>  hci_mgmt_cmd+0x9c6/0xef0 net/bluetooth/hci_sock.c:1712
>  hci_sock_sendmsg+0x6ca/0xee0 net/bluetooth/hci_sock.c:1832
>  sock_sendmsg_nosec net/socket.c:712 [inline]
>  __sock_sendmsg+0x219/0x270 net/socket.c:727
>  sock_write_iter+0x258/0x330 net/socket.c:1131
>  new_sync_write fs/read_write.c:591 [inline]
>  vfs_write+0x548/0xa90 fs/read_write.c:684
>  ksys_write+0x145/0x250 fs/read_write.c:736
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Freed by task 5700:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
>  kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
>  poison_slab_object mm/kasan/common.c:247 [inline]
>  __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
>  kasan_slab_free include/linux/kasan.h:233 [inline]
>  slab_free_hook mm/slub.c:2380 [inline]
>  slab_free mm/slub.c:4642 [inline]
>  kfree+0x193/0x440 mm/slub.c:4841
>  mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242
>  mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9362
>  hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1307
>  __sys_bind_socket net/socket.c:1810 [inline]
>  __sys_bind+0x2c3/0x3e0 net/socket.c:1841
>  __do_sys_bind net/socket.c:1846 [inline]
>  __se_sys_bind net/socket.c:1844 [inline]
>  __x64_sys_bind+0x7a/0x90 net/socket.c:1844
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Fixes: a380b6cff1a2 ("Bluetooth: Add generic mgmt helper API")
> Closes: https://syzkaller.appspot.com/bug?extid=feb0dc579bbe30a13190
> Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> ---
>  net/bluetooth/mgmt_util.c | 25 +++++++++++++++----------
>  1 file changed, 15 insertions(+), 10 deletions(-)
>
> diff --git a/net/bluetooth/mgmt_util.c b/net/bluetooth/mgmt_util.c
> index 3713ff490c65..c2dc8ddf5f78 100644
> --- a/net/bluetooth/mgmt_util.c
> +++ b/net/bluetooth/mgmt_util.c
> @@ -219,13 +219,20 @@ struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,
>  {
>         struct mgmt_pending_cmd *cmd;
>
> -       list_for_each_entry(cmd, &hdev->mgmt_pending, list) {
> +       rcu_read_lock();
> +
> +       list_for_each_entry_rcu(cmd, &hdev->mgmt_pending, list) {
>                 if (hci_sock_get_channel(cmd->sk) != channel)
>                         continue;
> -               if (cmd->opcode == opcode)
> +
> +               if (cmd->opcode == opcode) {
> +                       rcu_read_unlock();
>                         return cmd;
> +               }
>         }
>
> +       rcu_read_unlock();
> +
>         return NULL;
>  }
>
> @@ -233,14 +240,11 @@ void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
>                           void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
>                           void *data)
>  {
> -       struct mgmt_pending_cmd *cmd, *tmp;
> -
> -       list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
> -               if (opcode > 0 && cmd->opcode != opcode)
> -                       continue;
> +       struct mgmt_pending_cmd *cmd;
>
> +       cmd = mgmt_pending_find(HCI_CHANNEL_CONTROL, opcode, hdev);
> +       if (cmd)
>                 cb(cmd, data);
> -       }
>  }
>
>  struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,
> @@ -280,7 +284,7 @@ struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
>         if (!cmd)
>                 return NULL;
>
> -       list_add_tail(&cmd->list, &hdev->mgmt_pending);
> +       list_add_tail_rcu(&cmd->list, &hdev->mgmt_pending);
>
>         return cmd;
>  }
> @@ -294,7 +298,8 @@ void mgmt_pending_free(struct mgmt_pending_cmd *cmd)
>
>  void mgmt_pending_remove(struct mgmt_pending_cmd *cmd)
>  {
> -       list_del(&cmd->list);
> +       list_del_rcu(&cmd->list);
> +       synchronize_rcu();
>         mgmt_pending_free(cmd);
>  }
>
> --
> 2.49.0
>


--
Luiz Augusto von Dentz

Re: [syzbot] Re: [PATCH v3] Bluetooth: MGMT: Protect mgmt_pending list with its own lock

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: Re: [PATCH v3] Bluetooth: MGMT: Protect mgmt_pending list with its own lock
Author: luiz.dentz@gmail.com

#syz test

On Mon, Jun 2, 2025 at 1:46 PM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
>
> This uses a mutex to protect from concurrent access of mgmt_pending
> list which can cause crashes like:
>
> ==================================================================
> BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
> Read of size 8 at addr ffff888048891a18 by task kworker/u5:8/5333
>
> CPU: 0 UID: 0 PID: 5333 Comm: kworker/u5:8 Not tainted 6.15.0-rc5-syzkaller-00197-gea34704d6ad7 #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> Workqueue: hci0 hci_cmd_sync_work
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
>  print_address_description mm/kasan/report.c:408 [inline]
>  print_report+0xb4/0x290 mm/kasan/report.c:521
>  kasan_report+0x118/0x150 mm/kasan/report.c:634
>  mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5405
>  hci_cmd_sync_work+0x25e/0x3a0 net/bluetooth/hci_sync.c:334
>  process_one_work kernel/workqueue.c:3238 [inline]
>  process_scheduled_works+0xadb/0x17a0 kernel/workqueue.c:3319
>  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
>  kthread+0x70e/0x8a0 kernel/kthread.c:464
>  ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:153
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
>
> Allocated by task 5702:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
>  poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>  __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
>  kasan_kmalloc include/linux/kasan.h:260 [inline]
>  __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
>  kmalloc_noprof include/linux/slab.h:905 [inline]
>  kzalloc_noprof include/linux/slab.h:1039 [inline]
>  mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252
>  mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279
>  remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5453
>  hci_mgmt_cmd+0x9c6/0xef0 net/bluetooth/hci_sock.c:1712
>  hci_sock_sendmsg+0x6ca/0xee0 net/bluetooth/hci_sock.c:1832
>  sock_sendmsg_nosec net/socket.c:712 [inline]
>  __sock_sendmsg+0x219/0x270 net/socket.c:727
>  sock_write_iter+0x258/0x330 net/socket.c:1131
>  new_sync_write fs/read_write.c:591 [inline]
>  vfs_write+0x548/0xa90 fs/read_write.c:684
>  ksys_write+0x145/0x250 fs/read_write.c:736
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Freed by task 5700:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
>  kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
>  poison_slab_object mm/kasan/common.c:247 [inline]
>  __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
>  kasan_slab_free include/linux/kasan.h:233 [inline]
>  slab_free_hook mm/slub.c:2380 [inline]
>  slab_free mm/slub.c:4642 [inline]
>  kfree+0x193/0x440 mm/slub.c:4841
>  mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242
>  mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9362
>  hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1307
>  __sys_bind_socket net/socket.c:1810 [inline]
>  __sys_bind+0x2c3/0x3e0 net/socket.c:1841
>  __do_sys_bind net/socket.c:1846 [inline]
>  __se_sys_bind net/socket.c:1844 [inline]
>  __x64_sys_bind+0x7a/0x90 net/socket.c:1844
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Fixes: a380b6cff1a2 ("Bluetooth: Add generic mgmt helper API")
> Closes: https://syzkaller.appspot.com/bug?extid=feb0dc579bbe30a13190
> Closes: https://syzkaller.appspot.com/bug?extid=0a7039d5d9986ff4ececi
> Closes: https://syzkaller.appspot.com/bug?extid=cc0cc52e7f43dc9e6df1
> Reported-by: syzbot+feb0dc579bbe30a13190@syzkaller.appspotmail.com
> Tested-by: syzbot+feb0dc579bbe30a13190@syzkaller.appspotmail.com
> Tested-by: syzbot+0a7039d5d9986ff4ecec@syzkaller.appspotmail.com
> Tested-by: syzbot+cc0cc52e7f43dc9e6df1@syzkaller.appspotmail.com
> Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> ---
>  include/net/bluetooth/hci_core.h |   1 +
>  net/bluetooth/hci_core.c         |   1 +
>  net/bluetooth/mgmt.c             | 101 +++++++++++++++----------------
>  net/bluetooth/mgmt_util.c        |  32 ++++++++--
>  net/bluetooth/mgmt_util.h        |   4 +-
>  5 files changed, 80 insertions(+), 59 deletions(-)
>
> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
> index 2b261e74e2c4..b9ff0e825071 100644
> --- a/include/net/bluetooth/hci_core.h
> +++ b/include/net/bluetooth/hci_core.h
> @@ -546,6 +546,7 @@ struct hci_dev {
>         struct hci_conn_hash    conn_hash;
>
>         struct list_head        mesh_pending;
> +       struct mutex            mgmt_pending_lock;
>         struct list_head        mgmt_pending;
>         struct list_head        reject_list;
>         struct list_head        accept_list;
> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> index 04845ff3ad57..f197f5497043 100644
> --- a/net/bluetooth/hci_core.c
> +++ b/net/bluetooth/hci_core.c
> @@ -2487,6 +2487,7 @@ struct hci_dev *hci_alloc_dev_priv(int sizeof_priv)
>
>         mutex_init(&hdev->lock);
>         mutex_init(&hdev->req_lock);
> +       mutex_init(&hdev->mgmt_pending_lock);
>
>         ida_init(&hdev->unset_handle_ida);
>
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index 14a9462fced5..7d9ed7db377f 100644
> --- a/net/bluetooth/mgmt.c
> +++ b/net/bluetooth/mgmt.c
> @@ -1447,22 +1447,17 @@ static void settings_rsp(struct mgmt_pending_cmd *cmd, void *data)
>
>         send_settings_rsp(cmd->sk, cmd->opcode, match->hdev);
>
> -       list_del(&cmd->list);
> -
>         if (match->sk == NULL) {
>                 match->sk = cmd->sk;
>                 sock_hold(match->sk);
>         }
> -
> -       mgmt_pending_free(cmd);
>  }
>
>  static void cmd_status_rsp(struct mgmt_pending_cmd *cmd, void *data)
>  {
>         u8 *status = data;
>
> -       mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, *status);
> -       mgmt_pending_remove(cmd);
> +       mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, *status);
>  }
>
>  static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data)
> @@ -1476,8 +1471,6 @@ static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data)
>
>         if (cmd->cmd_complete) {
>                 cmd->cmd_complete(cmd, match->mgmt_status);
> -               mgmt_pending_remove(cmd);
> -
>                 return;
>         }
>
> @@ -1486,13 +1479,13 @@ static void cmd_complete_rsp(struct mgmt_pending_cmd *cmd, void *data)
>
>  static int generic_cmd_complete(struct mgmt_pending_cmd *cmd, u8 status)
>  {
> -       return mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status,
> +       return mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, status,
>                                  cmd->param, cmd->param_len);
>  }
>
>  static int addr_cmd_complete(struct mgmt_pending_cmd *cmd, u8 status)
>  {
> -       return mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status,
> +       return mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, status,
>                                  cmd->param, sizeof(struct mgmt_addr_info));
>  }
>
> @@ -1532,7 +1525,7 @@ static void mgmt_set_discoverable_complete(struct hci_dev *hdev, void *data,
>
>         if (err) {
>                 u8 mgmt_err = mgmt_status(err);
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
>                 hci_dev_clear_flag(hdev, HCI_LIMITED_DISCOVERABLE);
>                 goto done;
>         }
> @@ -1707,7 +1700,7 @@ static void mgmt_set_connectable_complete(struct hci_dev *hdev, void *data,
>
>         if (err) {
>                 u8 mgmt_err = mgmt_status(err);
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
>                 goto done;
>         }
>
> @@ -1943,8 +1936,8 @@ static void set_ssp_complete(struct hci_dev *hdev, void *data, int err)
>                         new_settings(hdev, NULL);
>                 }
>
> -               mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, cmd_status_rsp,
> -                                    &mgmt_err);
> +               mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, true,
> +                                    cmd_status_rsp, &mgmt_err);
>                 return;
>         }
>
> @@ -1954,7 +1947,7 @@ static void set_ssp_complete(struct hci_dev *hdev, void *data, int err)
>                 changed = hci_dev_test_and_clear_flag(hdev, HCI_SSP_ENABLED);
>         }
>
> -       mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, settings_rsp, &match);
> +       mgmt_pending_foreach(MGMT_OP_SET_SSP, hdev, true, settings_rsp, &match);
>
>         if (changed)
>                 new_settings(hdev, match.sk);
> @@ -2074,12 +2067,12 @@ static void set_le_complete(struct hci_dev *hdev, void *data, int err)
>         bt_dev_dbg(hdev, "err %d", err);
>
>         if (status) {
> -               mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, cmd_status_rsp,
> -                                                       &status);
> +               mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, true, cmd_status_rsp,
> +                                    &status);
>                 return;
>         }
>
> -       mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, settings_rsp, &match);
> +       mgmt_pending_foreach(MGMT_OP_SET_LE, hdev, true, settings_rsp, &match);
>
>         new_settings(hdev, match.sk);
>
> @@ -2138,7 +2131,7 @@ static void set_mesh_complete(struct hci_dev *hdev, void *data, int err)
>         struct sock *sk = cmd->sk;
>
>         if (status) {
> -               mgmt_pending_foreach(MGMT_OP_SET_MESH_RECEIVER, hdev,
> +               mgmt_pending_foreach(MGMT_OP_SET_MESH_RECEIVER, hdev, true,
>                                      cmd_status_rsp, &status);
>                 return;
>         }
> @@ -2638,7 +2631,7 @@ static void mgmt_class_complete(struct hci_dev *hdev, void *data, int err)
>
>         bt_dev_dbg(hdev, "err %d", err);
>
> -       mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> +       mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
>                           mgmt_status(err), hdev->dev_class, 3);
>
>         mgmt_pending_free(cmd);
> @@ -3427,7 +3420,7 @@ static int pairing_complete(struct mgmt_pending_cmd *cmd, u8 status)
>         bacpy(&rp.addr.bdaddr, &conn->dst);
>         rp.addr.type = link_to_bdaddr(conn->type, conn->dst_type);
>
> -       err = mgmt_cmd_complete(cmd->sk, cmd->index, MGMT_OP_PAIR_DEVICE,
> +       err = mgmt_cmd_complete(cmd->sk, cmd->hdev->id, MGMT_OP_PAIR_DEVICE,
>                                 status, &rp, sizeof(rp));
>
>         /* So we don't get further callbacks for this connection */
> @@ -5196,7 +5189,7 @@ static void mgmt_add_adv_patterns_monitor_complete(struct hci_dev *hdev,
>                 hci_update_passive_scan(hdev);
>         }
>
> -       mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> +       mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
>                           mgmt_status(status), &rp, sizeof(rp));
>         mgmt_pending_remove(cmd);
>
> @@ -5411,7 +5404,7 @@ static void mgmt_remove_adv_monitor_complete(struct hci_dev *hdev,
>         if (!status)
>                 hci_update_passive_scan(hdev);
>
> -       mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> +       mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
>                           mgmt_status(status), &rp, sizeof(rp));
>         mgmt_pending_remove(cmd);
>
> @@ -5792,7 +5785,7 @@ static void start_discovery_complete(struct hci_dev *hdev, void *data, int err)
>             cmd != pending_find(MGMT_OP_START_SERVICE_DISCOVERY, hdev))
>                 return;
>
> -       mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, mgmt_status(err),
> +       mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_status(err),
>                           cmd->param, 1);
>         mgmt_pending_remove(cmd);
>
> @@ -6013,7 +6006,7 @@ static void stop_discovery_complete(struct hci_dev *hdev, void *data, int err)
>
>         bt_dev_dbg(hdev, "err %d", err);
>
> -       mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, mgmt_status(err),
> +       mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_status(err),
>                           cmd->param, 1);
>         mgmt_pending_remove(cmd);
>
> @@ -6238,7 +6231,7 @@ static void set_advertising_complete(struct hci_dev *hdev, void *data, int err)
>         u8 status = mgmt_status(err);
>
>         if (status) {
> -               mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev,
> +               mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, true,
>                                      cmd_status_rsp, &status);
>                 return;
>         }
> @@ -6248,7 +6241,7 @@ static void set_advertising_complete(struct hci_dev *hdev, void *data, int err)
>         else
>                 hci_dev_clear_flag(hdev, HCI_ADVERTISING);
>
> -       mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, settings_rsp,
> +       mgmt_pending_foreach(MGMT_OP_SET_ADVERTISING, hdev, true, settings_rsp,
>                              &match);
>
>         new_settings(hdev, match.sk);
> @@ -6592,7 +6585,7 @@ static void set_bredr_complete(struct hci_dev *hdev, void *data, int err)
>                  */
>                 hci_dev_clear_flag(hdev, HCI_BREDR_ENABLED);
>
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
>         } else {
>                 send_settings_rsp(cmd->sk, MGMT_OP_SET_BREDR, hdev);
>                 new_settings(hdev, cmd->sk);
> @@ -6729,7 +6722,7 @@ static void set_secure_conn_complete(struct hci_dev *hdev, void *data, int err)
>         if (err) {
>                 u8 mgmt_err = mgmt_status(err);
>
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode, mgmt_err);
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode, mgmt_err);
>                 goto done;
>         }
>
> @@ -7176,7 +7169,7 @@ static void get_conn_info_complete(struct hci_dev *hdev, void *data, int err)
>                 rp.max_tx_power = HCI_TX_POWER_INVALID;
>         }
>
> -       mgmt_cmd_complete(cmd->sk, cmd->index, MGMT_OP_GET_CONN_INFO, status,
> +       mgmt_cmd_complete(cmd->sk, cmd->hdev->id, MGMT_OP_GET_CONN_INFO, status,
>                           &rp, sizeof(rp));
>
>         mgmt_pending_free(cmd);
> @@ -7336,7 +7329,7 @@ static void get_clock_info_complete(struct hci_dev *hdev, void *data, int err)
>         }
>
>  complete:
> -       mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode, status, &rp,
> +       mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode, status, &rp,
>                           sizeof(rp));
>
>         mgmt_pending_free(cmd);
> @@ -8586,10 +8579,10 @@ static void add_advertising_complete(struct hci_dev *hdev, void *data, int err)
>         rp.instance = cp->instance;
>
>         if (err)
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                 mgmt_status(err));
>         else
> -               mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                   mgmt_status(err), &rp, sizeof(rp));
>
>         add_adv_complete(hdev, cmd->sk, cp->instance, err);
> @@ -8777,10 +8770,10 @@ static void add_ext_adv_params_complete(struct hci_dev *hdev, void *data,
>
>                 hci_remove_adv_instance(hdev, cp->instance);
>
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                 mgmt_status(err));
>         } else {
> -               mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                   mgmt_status(err), &rp, sizeof(rp));
>         }
>
> @@ -8927,10 +8920,10 @@ static void add_ext_adv_data_complete(struct hci_dev *hdev, void *data, int err)
>         rp.instance = cp->instance;
>
>         if (err)
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                 mgmt_status(err));
>         else
> -               mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                   mgmt_status(err), &rp, sizeof(rp));
>
>         mgmt_pending_free(cmd);
> @@ -9089,10 +9082,10 @@ static void remove_advertising_complete(struct hci_dev *hdev, void *data,
>         rp.instance = cp->instance;
>
>         if (err)
> -               mgmt_cmd_status(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_status(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                 mgmt_status(err));
>         else
> -               mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
> +               mgmt_cmd_complete(cmd->sk, cmd->hdev->id, cmd->opcode,
>                                   MGMT_STATUS_SUCCESS, &rp, sizeof(rp));
>
>         mgmt_pending_free(cmd);
> @@ -9364,7 +9357,7 @@ void mgmt_index_removed(struct hci_dev *hdev)
>         if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
>                 return;
>
> -       mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
> +       mgmt_pending_foreach(0, hdev, true, cmd_complete_rsp, &match);
>
>         if (hci_dev_test_flag(hdev, HCI_UNCONFIGURED)) {
>                 mgmt_index_event(MGMT_EV_UNCONF_INDEX_REMOVED, hdev, NULL, 0,
> @@ -9402,7 +9395,8 @@ void mgmt_power_on(struct hci_dev *hdev, int err)
>                 hci_update_passive_scan(hdev);
>         }
>
> -       mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
> +       mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, true, settings_rsp,
> +                            &match);
>
>         new_settings(hdev, match.sk);
>
> @@ -9417,7 +9411,8 @@ void __mgmt_power_off(struct hci_dev *hdev)
>         struct cmd_lookup match = { NULL, hdev };
>         u8 zero_cod[] = { 0, 0, 0 };
>
> -       mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, settings_rsp, &match);
> +       mgmt_pending_foreach(MGMT_OP_SET_POWERED, hdev, true, settings_rsp,
> +                            &match);
>
>         /* If the power off is because of hdev unregistration let
>          * use the appropriate INVALID_INDEX status. Otherwise use
> @@ -9431,7 +9426,7 @@ void __mgmt_power_off(struct hci_dev *hdev)
>         else
>                 match.mgmt_status = MGMT_STATUS_NOT_POWERED;
>
> -       mgmt_pending_foreach(0, hdev, cmd_complete_rsp, &match);
> +       mgmt_pending_foreach(0, hdev, true, cmd_complete_rsp, &match);
>
>         if (memcmp(hdev->dev_class, zero_cod, sizeof(zero_cod)) != 0) {
>                 mgmt_limited_event(MGMT_EV_CLASS_OF_DEV_CHANGED, hdev,
> @@ -9672,7 +9667,6 @@ static void unpair_device_rsp(struct mgmt_pending_cmd *cmd, void *data)
>         device_unpaired(hdev, &cp->addr.bdaddr, cp->addr.type, cmd->sk);
>
>         cmd->cmd_complete(cmd, 0);
> -       mgmt_pending_remove(cmd);
>  }
>
>  bool mgmt_powering_down(struct hci_dev *hdev)
> @@ -9728,8 +9722,8 @@ void mgmt_disconnect_failed(struct hci_dev *hdev, bdaddr_t *bdaddr,
>         struct mgmt_cp_disconnect *cp;
>         struct mgmt_pending_cmd *cmd;
>
> -       mgmt_pending_foreach(MGMT_OP_UNPAIR_DEVICE, hdev, unpair_device_rsp,
> -                            hdev);
> +       mgmt_pending_foreach(MGMT_OP_UNPAIR_DEVICE, hdev, true,
> +                            unpair_device_rsp, hdev);
>
>         cmd = pending_find(MGMT_OP_DISCONNECT, hdev);
>         if (!cmd)
> @@ -9922,7 +9916,7 @@ void mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)
>
>         if (status) {
>                 u8 mgmt_err = mgmt_status(status);
> -               mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev,
> +               mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, true,
>                                      cmd_status_rsp, &mgmt_err);
>                 return;
>         }
> @@ -9932,8 +9926,8 @@ void mgmt_auth_enable_complete(struct hci_dev *hdev, u8 status)
>         else
>                 changed = hci_dev_test_and_clear_flag(hdev, HCI_LINK_SECURITY);
>
> -       mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, settings_rsp,
> -                            &match);
> +       mgmt_pending_foreach(MGMT_OP_SET_LINK_SECURITY, hdev, true,
> +                            settings_rsp, &match);
>
>         if (changed)
>                 new_settings(hdev, match.sk);
> @@ -9957,9 +9951,12 @@ void mgmt_set_class_of_dev_complete(struct hci_dev *hdev, u8 *dev_class,
>  {
>         struct cmd_lookup match = { NULL, hdev, mgmt_status(status) };
>
> -       mgmt_pending_foreach(MGMT_OP_SET_DEV_CLASS, hdev, sk_lookup, &match);
> -       mgmt_pending_foreach(MGMT_OP_ADD_UUID, hdev, sk_lookup, &match);
> -       mgmt_pending_foreach(MGMT_OP_REMOVE_UUID, hdev, sk_lookup, &match);
> +       mgmt_pending_foreach(MGMT_OP_SET_DEV_CLASS, hdev, false, sk_lookup,
> +                            &match);
> +       mgmt_pending_foreach(MGMT_OP_ADD_UUID, hdev, false, sk_lookup,
> +                            &match);
> +       mgmt_pending_foreach(MGMT_OP_REMOVE_UUID, hdev, false, sk_lookup,
> +                            &match);
>
>         if (!status) {
>                 mgmt_limited_event(MGMT_EV_CLASS_OF_DEV_CHANGED, hdev, dev_class,
> diff --git a/net/bluetooth/mgmt_util.c b/net/bluetooth/mgmt_util.c
> index 3713ff490c65..a88a07da3947 100644
> --- a/net/bluetooth/mgmt_util.c
> +++ b/net/bluetooth/mgmt_util.c
> @@ -217,30 +217,47 @@ int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
>  struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,
>                                            struct hci_dev *hdev)
>  {
> -       struct mgmt_pending_cmd *cmd;
> +       struct mgmt_pending_cmd *cmd, *tmp;
>
> -       list_for_each_entry(cmd, &hdev->mgmt_pending, list) {
> +       mutex_lock(&hdev->mgmt_pending_lock);
> +
> +       list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
>                 if (hci_sock_get_channel(cmd->sk) != channel)
>                         continue;
> -               if (cmd->opcode == opcode)
> +
> +               if (cmd->opcode == opcode) {
> +                       mutex_unlock(&hdev->mgmt_pending_lock);
>                         return cmd;
> +               }
>         }
>
> +       mutex_unlock(&hdev->mgmt_pending_lock);
> +
>         return NULL;
>  }
>
> -void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
> +void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev, bool remove,
>                           void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
>                           void *data)
>  {
>         struct mgmt_pending_cmd *cmd, *tmp;
>
> +       mutex_lock(&hdev->mgmt_pending_lock);
> +
>         list_for_each_entry_safe(cmd, tmp, &hdev->mgmt_pending, list) {
>                 if (opcode > 0 && cmd->opcode != opcode)
>                         continue;
>
> +               if (remove)
> +                       list_del(&cmd->list);
> +
>                 cb(cmd, data);
> +
> +               if (remove)
> +                       mgmt_pending_free(cmd);
>         }
> +
> +       mutex_unlock(&hdev->mgmt_pending_lock);
>  }
>
>  struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,
> @@ -254,7 +271,7 @@ struct mgmt_pending_cmd *mgmt_pending_new(struct sock *sk, u16 opcode,
>                 return NULL;
>
>         cmd->opcode = opcode;
> -       cmd->index = hdev->id;
> +       cmd->hdev = hdev;
>
>         cmd->param = kmemdup(data, len, GFP_KERNEL);
>         if (!cmd->param) {
> @@ -280,7 +297,9 @@ struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
>         if (!cmd)
>                 return NULL;
>
> +       mutex_lock(&hdev->mgmt_pending_lock);
>         list_add_tail(&cmd->list, &hdev->mgmt_pending);
> +       mutex_unlock(&hdev->mgmt_pending_lock);
>
>         return cmd;
>  }
> @@ -294,7 +313,10 @@ void mgmt_pending_free(struct mgmt_pending_cmd *cmd)
>
>  void mgmt_pending_remove(struct mgmt_pending_cmd *cmd)
>  {
> +       mutex_lock(&cmd->hdev->mgmt_pending_lock);
>         list_del(&cmd->list);
> +       mutex_unlock(&cmd->hdev->mgmt_pending_lock);
> +
>         mgmt_pending_free(cmd);
>  }
>
> diff --git a/net/bluetooth/mgmt_util.h b/net/bluetooth/mgmt_util.h
> index f2ba994ab1d8..024e51dd6937 100644
> --- a/net/bluetooth/mgmt_util.h
> +++ b/net/bluetooth/mgmt_util.h
> @@ -33,7 +33,7 @@ struct mgmt_mesh_tx {
>  struct mgmt_pending_cmd {
>         struct list_head list;
>         u16 opcode;
> -       int index;
> +       struct hci_dev *hdev;
>         void *param;
>         size_t param_len;
>         struct sock *sk;
> @@ -54,7 +54,7 @@ int mgmt_cmd_complete(struct sock *sk, u16 index, u16 cmd, u8 status,
>
>  struct mgmt_pending_cmd *mgmt_pending_find(unsigned short channel, u16 opcode,
>                                            struct hci_dev *hdev);
> -void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev,
> +void mgmt_pending_foreach(u16 opcode, struct hci_dev *hdev, bool remove,
>                           void (*cb)(struct mgmt_pending_cmd *cmd, void *data),
>                           void *data);
>  struct mgmt_pending_cmd *mgmt_pending_add(struct sock *sk, u16 opcode,
> --
> 2.49.0
>


-- 
Luiz Augusto von Dentz

Re: [syzbot] Re: [PATCH v4 1/2] Bluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete

[syzbot]

For archival purposes, forwarding an incoming command email to
linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com.

***

Subject: Re: [PATCH v4 1/2] Bluetooth: MGMT: Fix UAF on mgmt_remove_adv_monitor_complete
Author: luiz.dentz@gmail.com

#syz test

On Tue, Jun 3, 2025 at 4:29 PM Luiz Augusto von Dentz
<luiz.dentz@gmail.com> wrote:
>
> From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
>
> This reworks MGMT_OP_REMOVE_ADV_MONITOR to not use mgmt_pending_add to
> avoid crashes like bellow:
>
> ==================================================================
> BUG: KASAN: slab-use-after-free in mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406
> Read of size 8 at addr ffff88801c53f318 by task kworker/u5:5/5341
>
> CPU: 0 UID: 0 PID: 5341 Comm: kworker/u5:5 Not tainted 6.15.0-syzkaller-10402-g4cb6c8af8591 #0 PREEMPT(full)
> Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
> Workqueue: hci0 hci_cmd_sync_work
> Call Trace:
>  <TASK>
>  dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120
>  print_address_description mm/kasan/report.c:408 [inline]
>  print_report+0xd2/0x2b0 mm/kasan/report.c:521
>  kasan_report+0x118/0x150 mm/kasan/report.c:634
>  mgmt_remove_adv_monitor_complete+0xe5/0x540 net/bluetooth/mgmt.c:5406
>  hci_cmd_sync_work+0x261/0x3a0 net/bluetooth/hci_sync.c:334
>  process_one_work kernel/workqueue.c:3238 [inline]
>  process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321
>  worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
>  kthread+0x711/0x8a0 kernel/kthread.c:464
>  ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
>  ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
>  </TASK>
>
> Allocated by task 5987:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
>  poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
>  __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394
>  kasan_kmalloc include/linux/kasan.h:260 [inline]
>  __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4358
>  kmalloc_noprof include/linux/slab.h:905 [inline]
>  kzalloc_noprof include/linux/slab.h:1039 [inline]
>  mgmt_pending_new+0x65/0x240 net/bluetooth/mgmt_util.c:252
>  mgmt_pending_add+0x34/0x120 net/bluetooth/mgmt_util.c:279
>  remove_adv_monitor+0x103/0x1b0 net/bluetooth/mgmt.c:5454
>  hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719
>  hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839
>  sock_sendmsg_nosec net/socket.c:712 [inline]
>  __sock_sendmsg+0x219/0x270 net/socket.c:727
>  sock_write_iter+0x258/0x330 net/socket.c:1131
>  new_sync_write fs/read_write.c:593 [inline]
>  vfs_write+0x548/0xa90 fs/read_write.c:686
>  ksys_write+0x145/0x250 fs/read_write.c:738
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Freed by task 5989:
>  kasan_save_stack mm/kasan/common.c:47 [inline]
>  kasan_save_track+0x3e/0x80 mm/kasan/common.c:68
>  kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576
>  poison_slab_object mm/kasan/common.c:247 [inline]
>  __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264
>  kasan_slab_free include/linux/kasan.h:233 [inline]
>  slab_free_hook mm/slub.c:2380 [inline]
>  slab_free mm/slub.c:4642 [inline]
>  kfree+0x18e/0x440 mm/slub.c:4841
>  mgmt_pending_foreach+0xc9/0x120 net/bluetooth/mgmt_util.c:242
>  mgmt_index_removed+0x10d/0x2f0 net/bluetooth/mgmt.c:9366
>  hci_sock_bind+0xbe9/0x1000 net/bluetooth/hci_sock.c:1314
>  __sys_bind_socket net/socket.c:1810 [inline]
>  __sys_bind+0x2c3/0x3e0 net/socket.c:1841
>  __do_sys_bind net/socket.c:1846 [inline]
>  __se_sys_bind net/socket.c:1844 [inline]
>  __x64_sys_bind+0x7a/0x90 net/socket.c:1844
>  do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
>  do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
>  entry_SYSCALL_64_after_hwframe+0x77/0x7f
>
> Fixes: 66bd095ab5d4 ("Bluetooth: advmon offload MSFT remove monitor")
> Closes: https://syzkaller.appspot.com/bug?extid=feb0dc579bbe30a13190
> Reported-by: syzbot+feb0dc579bbe30a13190@syzkaller.appspotmail.com
> Tested-by: syzbot+feb0dc579bbe30a13190@syzkaller.appspotmail.com
> Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
> ---
>  include/net/bluetooth/hci_core.h |  1 -
>  net/bluetooth/hci_core.c         |  4 +---
>  net/bluetooth/mgmt.c             | 37 ++++++++++----------------------
>  3 files changed, 12 insertions(+), 30 deletions(-)
>
> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
> index 2b261e74e2c4..93fcb659f0d4 100644
> --- a/include/net/bluetooth/hci_core.h
> +++ b/include/net/bluetooth/hci_core.h
> @@ -2400,7 +2400,6 @@ void mgmt_advertising_added(struct sock *sk, struct hci_dev *hdev,
>                             u8 instance);
>  void mgmt_advertising_removed(struct sock *sk, struct hci_dev *hdev,
>                               u8 instance);
> -void mgmt_adv_monitor_removed(struct hci_dev *hdev, u16 handle);
>  int mgmt_phy_configuration_changed(struct hci_dev *hdev, struct sock *skip);
>  void mgmt_adv_monitor_device_lost(struct hci_dev *hdev, u16 handle,
>                                   bdaddr_t *bdaddr, u8 addr_type);
> diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
> index 04845ff3ad57..aeda2e4557d5 100644
> --- a/net/bluetooth/hci_core.c
> +++ b/net/bluetooth/hci_core.c
> @@ -1877,10 +1877,8 @@ void hci_free_adv_monitor(struct hci_dev *hdev, struct adv_monitor *monitor)
>         if (monitor->handle)
>                 idr_remove(&hdev->adv_monitors_idr, monitor->handle);
>
> -       if (monitor->state != ADV_MONITOR_STATE_NOT_REGISTERED) {
> +       if (monitor->state != ADV_MONITOR_STATE_NOT_REGISTERED)
>                 hdev->adv_monitors_cnt--;
> -               mgmt_adv_monitor_removed(hdev, monitor->handle);
> -       }
>
>         kfree(monitor);
>  }
> diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
> index 14a9462fced5..feaeec2423ae 100644
> --- a/net/bluetooth/mgmt.c
> +++ b/net/bluetooth/mgmt.c
> @@ -5108,24 +5108,14 @@ static void mgmt_adv_monitor_added(struct sock *sk, struct hci_dev *hdev,
>         mgmt_event(MGMT_EV_ADV_MONITOR_ADDED, hdev, &ev, sizeof(ev), sk);
>  }
>
> -void mgmt_adv_monitor_removed(struct hci_dev *hdev, u16 handle)
> +static void mgmt_adv_monitor_removed(struct sock *sk, struct hci_dev *hdev,
> +                                    u16 handle)
>  {
>         struct mgmt_ev_adv_monitor_removed ev;
> -       struct mgmt_pending_cmd *cmd;
> -       struct sock *sk_skip = NULL;
> -       struct mgmt_cp_remove_adv_monitor *cp;
> -
> -       cmd = pending_find(MGMT_OP_REMOVE_ADV_MONITOR, hdev);
> -       if (cmd) {
> -               cp = cmd->param;
> -
> -               if (cp->monitor_handle)
> -                       sk_skip = cmd->sk;
> -       }
>
>         ev.monitor_handle = cpu_to_le16(handle);
>
> -       mgmt_event(MGMT_EV_ADV_MONITOR_REMOVED, hdev, &ev, sizeof(ev), sk_skip);
> +       mgmt_event(MGMT_EV_ADV_MONITOR_REMOVED, hdev, &ev, sizeof(ev), sk);
>  }
>
>  static int read_adv_mon_features(struct sock *sk, struct hci_dev *hdev,
> @@ -5227,8 +5217,7 @@ static int __add_adv_patterns_monitor(struct sock *sk, struct hci_dev *hdev,
>
>         if (pending_find(MGMT_OP_SET_LE, hdev) ||
>             pending_find(MGMT_OP_ADD_ADV_PATTERNS_MONITOR, hdev) ||
> -           pending_find(MGMT_OP_ADD_ADV_PATTERNS_MONITOR_RSSI, hdev) ||
> -           pending_find(MGMT_OP_REMOVE_ADV_MONITOR, hdev)) {
> +           pending_find(MGMT_OP_ADD_ADV_PATTERNS_MONITOR_RSSI, hdev)) {
>                 status = MGMT_STATUS_BUSY;
>                 goto unlock;
>         }
> @@ -5398,8 +5387,7 @@ static void mgmt_remove_adv_monitor_complete(struct hci_dev *hdev,
>         struct mgmt_pending_cmd *cmd = data;
>         struct mgmt_cp_remove_adv_monitor *cp;
>
> -       if (status == -ECANCELED ||
> -           cmd != pending_find(MGMT_OP_REMOVE_ADV_MONITOR, hdev))
> +       if (status == -ECANCELED)
>                 return;
>
>         hci_dev_lock(hdev);
> @@ -5408,12 +5396,14 @@ static void mgmt_remove_adv_monitor_complete(struct hci_dev *hdev,
>
>         rp.monitor_handle = cp->monitor_handle;
>
> -       if (!status)
> +       if (!status) {
> +               mgmt_adv_monitor_removed(cmd->sk, hdev, cp->monitor_handle);
>                 hci_update_passive_scan(hdev);
> +       }
>
>         mgmt_cmd_complete(cmd->sk, cmd->index, cmd->opcode,
>                           mgmt_status(status), &rp, sizeof(rp));
> -       mgmt_pending_remove(cmd);
> +       mgmt_pending_free(cmd);
>
>         hci_dev_unlock(hdev);
>         bt_dev_dbg(hdev, "remove monitor %d complete, status %d",
> @@ -5423,10 +5413,6 @@ static void mgmt_remove_adv_monitor_complete(struct hci_dev *hdev,
>  static int mgmt_remove_adv_monitor_sync(struct hci_dev *hdev, void *data)
>  {
>         struct mgmt_pending_cmd *cmd = data;
> -
> -       if (cmd != pending_find(MGMT_OP_REMOVE_ADV_MONITOR, hdev))
> -               return -ECANCELED;
> -
>         struct mgmt_cp_remove_adv_monitor *cp = cmd->param;
>         u16 handle = __le16_to_cpu(cp->monitor_handle);
>
> @@ -5445,14 +5431,13 @@ static int remove_adv_monitor(struct sock *sk, struct hci_dev *hdev,
>         hci_dev_lock(hdev);
>
>         if (pending_find(MGMT_OP_SET_LE, hdev) ||
> -           pending_find(MGMT_OP_REMOVE_ADV_MONITOR, hdev) ||
>             pending_find(MGMT_OP_ADD_ADV_PATTERNS_MONITOR, hdev) ||
>             pending_find(MGMT_OP_ADD_ADV_PATTERNS_MONITOR_RSSI, hdev)) {
>                 status = MGMT_STATUS_BUSY;
>                 goto unlock;
>         }
>
> -       cmd = mgmt_pending_add(sk, MGMT_OP_REMOVE_ADV_MONITOR, hdev, data, len);
> +       cmd = mgmt_pending_new(sk, MGMT_OP_REMOVE_ADV_MONITOR, hdev, data, len);
>         if (!cmd) {
>                 status = MGMT_STATUS_NO_RESOURCES;
>                 goto unlock;
> @@ -5462,7 +5447,7 @@ static int remove_adv_monitor(struct sock *sk, struct hci_dev *hdev,
>                                   mgmt_remove_adv_monitor_complete);
>
>         if (err) {
> -               mgmt_pending_remove(cmd);
> +               mgmt_pending_free(cmd);
>
>                 if (err == -ENOMEM)
>                         status = MGMT_STATUS_NO_RESOURCES;
> --
> 2.49.0
>


-- 
Luiz Augusto von Dentz

[syzbot] [bluetooth?] BUG: corrupted list in mgmt_pending_remove

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit:    fe1910f9337b tcp_bpf: fix return value of tcp_bpf_sendmsg()
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=171d6f7b980000
kernel config:  https://syzkaller.appspot.com/x/.config?x=996585887acdadb3
dashboard link: https://syzkaller.appspot.com/bug?extid=cc0cc52e7f43dc9e6df1
compiler:       Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40

Unfortunately, I don't have any reproducer for this issue yet.

Downloadable assets:
disk image: https://storage.googleapis.com/syzbot-assets/cb37d16e2860/disk-fe1910f9.raw.xz
vmlinux: https://storage.googleapis.com/syzbot-assets/315198aa296e/vmlinux-fe1910f9.xz
kernel image: https://storage.googleapis.com/syzbot-assets/b3e6fb9fa8a4/bzImage-fe1910f9.xz

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+cc0cc52e7f43dc9e6df1@syzkaller.appspotmail.com

list_del corruption, ffff88802943da00->next is LIST_POISON1 (dead000000000100)
------------[ cut here ]------------
kernel BUG at lib/list_debug.c:58!
Oops: invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI
CPU: 1 UID: 0 PID: 7763 Comm: syz.0.694 Not tainted 6.11.0-rc5-syzkaller-00151-gfe1910f9337b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024
RIP: 0010:__list_del_entry_valid_or_report+0xf4/0x140 lib/list_debug.c:56
Code: e8 71 64 fc 06 90 0f 0b 48 c7 c7 c0 90 60 8c 4c 89 fe e8 5f 64 fc 06 90 0f 0b 48 c7 c7 20 91 60 8c 4c 89 fe e8 4d 64 fc 06 90 <0f> 0b 48 c7 c7 80 91 60 8c 4c 89 fe e8 3b 64 fc 06 90 0f 0b 48 c7
RSP: 0018:ffffc9000492fb58 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000122 RCX: 5f038e50b22bff00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8174013c R09: 1ffff92000925f0c
R10: dffffc0000000000 R11: fffff52000925f0d R12: dffffc0000000000
R13: dffffc0000000000 R14: dead000000000100 R15: ffff88802943da00
FS:  00007fb7679de6c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffc967a2fc0 CR3: 00000000437dc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __list_del_entry_valid include/linux/list.h:124 [inline]
 __list_del_entry include/linux/list.h:215 [inline]
 list_del include/linux/list.h:229 [inline]
 mgmt_pending_remove+0x26/0x1a0 net/bluetooth/mgmt_util.c:314
 mgmt_pending_foreach+0xd1/0x130 net/bluetooth/mgmt_util.c:259
 mgmt_index_removed+0xe6/0x340 net/bluetooth/mgmt.c:9395
 hci_sock_bind+0xcce/0x1150 net/bluetooth/hci_sock.c:1307
 __sys_bind_socket net/socket.c:1833 [inline]
 __sys_bind+0x23d/0x2f0 net/socket.c:1857
 __do_sys_bind net/socket.c:1865 [inline]
 __se_sys_bind net/socket.c:1863 [inline]
 __x64_sys_bind+0x7a/0x90 net/socket.c:1863
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fb767f79eb9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fb7679de038 EFLAGS: 00000246 ORIG_RAX: 0000000000000031
RAX: ffffffffffffffda RBX: 00007fb768116058 RCX: 00007fb767f79eb9
RDX: 0000000000000006 RSI: 0000000020000040 RDI: 0000000000000004
RBP: 00007fb767fe793e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007fb768116058 R15: 00007fffd1ff2828
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__list_del_entry_valid_or_report+0xf4/0x140 lib/list_debug.c:56
Code: e8 71 64 fc 06 90 0f 0b 48 c7 c7 c0 90 60 8c 4c 89 fe e8 5f 64 fc 06 90 0f 0b 48 c7 c7 20 91 60 8c 4c 89 fe e8 4d 64 fc 06 90 <0f> 0b 48 c7 c7 80 91 60 8c 4c 89 fe e8 3b 64 fc 06 90 0f 0b 48 c7
RSP: 0018:ffffc9000492fb58 EFLAGS: 00010246
RAX: 000000000000004e RBX: dead000000000122 RCX: 5f038e50b22bff00
RDX: 0000000000000000 RSI: 0000000080000000 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff8174013c R09: 1ffff92000925f0c
R10: dffffc0000000000 R11: fffff52000925f0d R12: dffffc0000000000
R13: dffffc0000000000 R14: dead000000000100 R15: ffff88802943da00
FS:  00007fb7679de6c0(0000) GS:ffff8880b8900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f773e8e8178 CR3: 00000000437dc000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


---
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Re: [syzbot] #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac

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Subject: #syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac
Author: dmantipov@yandex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 94305e83eccb3120c921cd3a015cd74731140bac