From: syzbot <syzbot+d8f72178ab6783a7daea@syzkaller.appspotmail.com>
To: hdanton@sina.com, linux-kernel@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: [syzbot] [sound?] [usb?] WARNING: ODEBUG bug in snd_rawmidi_free
Date: Fri, 09 May 2025 00:10:01 -0700 [thread overview]
Message-ID: <681daa49.050a0220.a19a9.0128.GAE@google.com> (raw)
In-Reply-To: <20250508214743.1795-1-hdanton@sina.com>
Hello,
syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: slab-use-after-free Read in snd_usbmidi_error_timer
==================================================================
BUG: KASAN: slab-use-after-free in snd_usbmidi_error_timer+0x602/0x660 sound/usb/midi.c:352
Read of size 1 at addr ffff888033ed9543 by task udevd/5201
CPU: 1 UID: 0 PID: 5201 Comm: udevd Not tainted 6.15.0-rc5-syzkaller-00136-g9c69f8884904-dirty #0 PREEMPT(full)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/29/2025
Call Trace:
<IRQ>
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
snd_usbmidi_error_timer+0x602/0x660 sound/usb/midi.c:352
call_timer_fn+0x17b/0x5f0 kernel/time/timer.c:1789
expire_timers kernel/time/timer.c:1840 [inline]
__run_timers kernel/time/timer.c:2414 [inline]
__run_timer_base+0x61a/0x860 kernel/time/timer.c:2426
run_timer_base kernel/time/timer.c:2435 [inline]
run_timer_softirq+0xb7/0x180 kernel/time/timer.c:2445
handle_softirqs+0x283/0x870 kernel/softirq.c:579
__do_softirq kernel/softirq.c:613 [inline]
invoke_softirq kernel/softirq.c:453 [inline]
__irq_exit_rcu+0xca/0x1f0 kernel/softirq.c:680
irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1049 [inline]
sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1049
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__preempt_count_add arch/x86/include/asm/preempt.h:80 [inline]
RIP: 0010:rcu_is_watching+0x9/0xb0 kernel/rcu/tree.c:735
Code: 46 03 eb cc 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 41 57 41 56 53 <65> ff 05 a0 48 ce 10 e8 fb 29 af 09 89 c3 83 f8 08 73 65 49 bf 00
RSP: 0018:ffffc90003daf828 EFLAGS: 00000297
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e054920
RBP: ffffffff8214c37d R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff821706c4 R12: 0000000000000000
R13: ffffffff8e054920 R14: 0000000000000000 R15: 0000000000000001
trace_lock_acquire include/trace/events/lock.h:24 [inline]
lock_acquire+0x5f/0x360 kernel/locking/lockdep.c:5829
fs_reclaim_acquire+0x99/0x100 mm/page_alloc.c:4081
might_alloc include/linux/sched/mm.h:318 [inline]
slab_pre_alloc_hook mm/slub.c:4098 [inline]
slab_alloc_node mm/slub.c:4176 [inline]
kmem_cache_alloc_noprof+0x44/0x3c0 mm/slub.c:4203
alloc_empty_file+0x55/0x1d0 fs/file_table.c:234
path_openat+0x107/0x3830 fs/namei.c:4025
do_filp_open+0x1fa/0x410 fs/namei.c:4066
do_sys_openat2+0x121/0x1c0 fs/open.c:1429
do_sys_open fs/open.c:1444 [inline]
__do_sys_openat fs/open.c:1460 [inline]
__se_sys_openat fs/open.c:1455 [inline]
__x64_sys_openat+0x138/0x170 fs/open.c:1455
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
RIP: 0033:0x7efc39515c3a
Code: 41 89 f2 48 89 54 24 e0 41 83 e2 40 75 2a 89 f0 f7 d0 a9 00 00 41 00 74 1f 89 f2 b8 01 01 00 00 48 89 fe bf 9c ff ff ff 0f 05 <48> 3d 00 f0 ff ff 77 2e c3 0f 1f 44 00 00 48 8d 44 24 08 c7 44 24
RSP: 002b:00007fff30d743b8 EFLAGS: 00000206 ORIG_RAX: 0000000000000101
RAX: ffffffffffffffda RBX: 000055eedcc30190 RCX: 00007efc39515c3a
RDX: 0000000000090800 RSI: 000055eedca4f770 RDI: 00000000ffffff9c
RBP: 000055eedca4f770 R08: 0000000000000000 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000206 R12: 000055eedca3f780
R13: 00000000000000fd R14: 000055eed6dd3be0 R15: 00007fff30d746c0
</TASK>
Allocated by task 47:
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]
snd_usbmidi_in_endpoint_create+0x7e/0xa30 sound/usb/midi.c:1342
snd_usbmidi_create_endpoints_midiman sound/usb/midi.c:2362 [inline]
__snd_usbmidi_create+0x21bd/0x29d0 sound/usb/midi.c:2645
snd_usb_midi_v2_create+0x43e1/0x4650 sound/usb/midi2.c:1177
usb_audio_probe+0xb78/0x1e20 sound/usb/card.c:886
usb_probe_interface+0x641/0xbc0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9a0 drivers/base/dd.c:657
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:957
bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1029
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3692
usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c1/0x390 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9a0 drivers/base/dd.c:657
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:957
bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1029
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3692
usb_new_device+0xa39/0x16c0 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5531 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
port_event drivers/usb/core/hub.c:5831 [inline]
hub_event+0x2941/0x4a00 drivers/usb/core/hub.c:5913
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
Freed by task 47:
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
snd_usbmidi_free sound/usb/midi.c:1530 [inline]
snd_usbmidi_rawmidi_free+0xae/0x150 sound/usb/midi.c:1590
snd_rawmidi_free+0x3bc/0x410 sound/core/rawmidi.c:1934
snd_rawmidi_dev_free+0x38/0x50 sound/core/rawmidi.c:1945
__snd_device_free+0x1d2/0x2e0 sound/core/device.c:76
snd_device_free_all+0xcf/0x180 sound/core/device.c:233
snd_card_do_free sound/core/init.c:587 [inline]
release_card_device+0x75/0x1b0 sound/core/init.c:153
device_release+0x99/0x1c0 drivers/base/core.c:-1
kobject_cleanup lib/kobject.c:689 [inline]
kobject_release lib/kobject.c:720 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x228/0x480 lib/kobject.c:737
snd_card_free_when_closed sound/core/init.c:618 [inline]
snd_card_free+0x110/0x190 sound/core/init.c:650
usb_audio_probe+0x1949/0x1e20 sound/usb/card.c:944
usb_probe_interface+0x641/0xbc0 drivers/usb/core/driver.c:396
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9a0 drivers/base/dd.c:657
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:957
bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1029
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3692
usb_set_configuration+0x1a87/0x20e0 drivers/usb/core/message.c:2210
usb_generic_driver_probe+0x8d/0x150 drivers/usb/core/generic.c:250
usb_probe_device+0x1c1/0x390 drivers/usb/core/driver.c:291
call_driver_probe drivers/base/dd.c:-1 [inline]
really_probe+0x26a/0x9a0 drivers/base/dd.c:657
__driver_probe_device+0x18c/0x2f0 drivers/base/dd.c:799
driver_probe_device+0x4f/0x430 drivers/base/dd.c:829
__device_attach_driver+0x2ce/0x530 drivers/base/dd.c:957
bus_for_each_drv+0x24e/0x2e0 drivers/base/bus.c:462
__device_attach+0x2b8/0x400 drivers/base/dd.c:1029
bus_probe_device+0x185/0x260 drivers/base/bus.c:537
device_add+0x7b6/0xb50 drivers/base/core.c:3692
usb_new_device+0xa39/0x16c0 drivers/usb/core/hub.c:2663
hub_port_connect drivers/usb/core/hub.c:5531 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5671 [inline]
port_event drivers/usb/core/hub.c:5831 [inline]
hub_event+0x2941/0x4a00 drivers/usb/core/hub.c:5913
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
The buggy address belongs to the object at ffff888033ed9400
which belongs to the cache kmalloc-512 of size 512
The buggy address is located 323 bytes inside of
freed 512-byte region [ffff888033ed9400, ffff888033ed9600)
The buggy address belongs to the physical page:
page: refcount:0 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x33ed8
head: order:2 mapcount:0 entire_mapcount:0 nr_pages_mapped:0 pincount:0
anon flags: 0xfff00000000040(head|node=0|zone=1|lastcpupid=0x7ff)
page_type: f5(slab)
raw: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001
raw: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000040 ffff88801a041c80 0000000000000000 dead000000000001
head: 0000000000000000 0000000000100010 00000000f5000000 0000000000000000
head: 00fff00000000002 ffffea0000cfb601 00000000ffffffff 00000000ffffffff
head: ffffffffffffffff 0000000000000000 00000000ffffffff 0000000000000004
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3563, tgid 3563 (kworker/u8:8), ts 81305274736, free_ts 81130187591
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_pages_mpol+0x232/0x4a0 mm/mempolicy.c:2301
alloc_slab_page mm/slub.c:2450 [inline]
allocate_slab+0x8a/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_noprof+0x296/0x3d0 mm/slub.c:4353
kmalloc_noprof include/linux/slab.h:905 [inline]
kzalloc_noprof include/linux/slab.h:1039 [inline]
mca_alloc net/ipv6/mcast.c:884 [inline]
__ipv6_dev_mc_inc+0x420/0xaf0 net/ipv6/mcast.c:975
addrconf_join_solict net/ipv6/addrconf.c:2242 [inline]
addrconf_dad_begin net/ipv6/addrconf.c:4103 [inline]
addrconf_dad_work+0x3d0/0x14b0 net/ipv6/addrconf.c:4231
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
page last free pid 5931 tgid 5931 stack trace:
reset_page_owner include/linux/page_owner.h:25 [inline]
free_pages_prepare mm/page_alloc.c:1262 [inline]
__free_frozen_pages+0xb0e/0xcd0 mm/page_alloc.c:2725
__slab_free+0x326/0x400 mm/slub.c:4553
qlink_free mm/kasan/quarantine.c:163 [inline]
qlist_free_all+0x9a/0x140 mm/kasan/quarantine.c:179
kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
__kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:329
kasan_slab_alloc include/linux/kasan.h:250 [inline]
slab_post_alloc_hook mm/slub.c:4147 [inline]
slab_alloc_node mm/slub.c:4196 [inline]
kmem_cache_alloc_node_noprof+0x1bb/0x3c0 mm/slub.c:4248
__alloc_skb+0x112/0x2d0 net/core/skbuff.c:658
alloc_skb include/linux/skbuff.h:1340 [inline]
nlmsg_new include/net/netlink.h:1019 [inline]
rtmsg_ifa+0xf8/0x1f0 net/ipv4/devinet.c:2015
__inet_insert_ifa+0x9ff/0xbf0 net/ipv4/devinet.c:566
inet_rtm_newaddr+0xf3a/0x18b0 net/ipv4/devinet.c:1002
rtnetlink_rcv_msg+0x7cc/0xb70 net/core/rtnetlink.c:6955
netlink_rcv_skb+0x219/0x490 net/netlink/af_netlink.c:2534
netlink_unicast_kernel net/netlink/af_netlink.c:1313 [inline]
netlink_unicast+0x758/0x8d0 net/netlink/af_netlink.c:1339
netlink_sendmsg+0x805/0xb30 net/netlink/af_netlink.c:1883
sock_sendmsg_nosec net/socket.c:712 [inline]
__sock_sendmsg+0x219/0x270 net/socket.c:727
__sys_sendto+0x3bd/0x520 net/socket.c:2180
Memory state around the buggy address:
ffff888033ed9400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888033ed9480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff888033ed9500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff888033ed9580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff888033ed9600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================
----------------
Code disassembly (best guess):
0: 46 03 eb rex.RX add %ebx,%r13d
3: cc int3
4: 66 66 66 66 2e 0f 1f data16 data16 data16 cs nopw 0x0(%rax,%rax,1)
b: 84 00 00 00 00 00
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 90 nop
1a: 90 nop
1b: 90 nop
1c: 90 nop
1d: 90 nop
1e: 90 nop
1f: 90 nop
20: 90 nop
21: f3 0f 1e fa endbr64
25: 41 57 push %r15
27: 41 56 push %r14
29: 53 push %rbx
* 2a: 65 ff 05 a0 48 ce 10 incl %gs:0x10ce48a0(%rip) # 0x10ce48d1 <-- trapping instruction
31: e8 fb 29 af 09 call 0x9af2a31
36: 89 c3 mov %eax,%ebx
38: 83 f8 08 cmp $0x8,%eax
3b: 73 65 jae 0xa2
3d: 49 rex.WB
3e: bf .byte 0xbf
Tested on:
commit: 9c69f888 Merge tag 'bcachefs-2025-05-08' of git://evil..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=14da4768580000
kernel config: https://syzkaller.appspot.com/x/.config?x=91c351a0f6229e67
dashboard link: https://syzkaller.appspot.com/bug?extid=d8f72178ab6783a7daea
compiler: Debian clang version 20.1.2 (++20250402124445+58df0ef89dd6-1~exp1~20250402004600.97), Debian LLD 20.1.2
patch: https://syzkaller.appspot.com/x/patch.diff?x=1759d4f4580000
next parent reply other threads:[~2025-05-09 7:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20250508214743.1795-1-hdanton@sina.com>
2025-05-09 7:10 ` syzbot [this message]
[not found] <20250509124246.1843-1-hdanton@sina.com>
2025-05-09 13:22 ` [syzbot] [sound?] [usb?] WARNING: ODEBUG bug in snd_rawmidi_free syzbot
[not found] <20250509103741.1822-1-hdanton@sina.com>
2025-05-09 12:04 ` syzbot
2025-05-08 8:52 syzbot
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