[syzbot] KASAN: use-after-free Read in cfusbl_device_notify

syzbot
2022-10-12T17:00:20Z

Hello,

syzbot found the following issue on:

HEAD commit: 3e732ebf7316 Merge tag 'for_linus' of git://git.kernel.org..
git tree: upstream
console output: https://syzkaller.appspot.com/x/log.txt?x=1179e860f00000
kernel config: https://syzkaller.appspot.com/x/.config?x=28c55132a1961e10
dashboard link: https://syzkaller.appspot.com/bug?extid=b563d33852b893653a9e
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
syz repro: https://syzkaller.appspot.com/x/repro.syz?x=13b36b5f700000
C reproducer: https://syzkaller.appspot.com/x/repro.c?x=12c50018f00000

The issue was bisected to:

commit da0efe30944476275c902c52fbac812db0541d87
Author: Muchun Song <songmuchun@bytedance.com>
Date: Tue Mar 22 21:41:15 2022 +0000

mm: memcontrol: move memcg_online_kmem() to mem_cgroup_css_online()

bisection log: https://syzkaller.appspot.com/x/bisect.txt?x=14f62690f00000
final oops: https://syzkaller.appspot.com/x/report.txt?x=16f62690f00000
console output: https://syzkaller.appspot.com/x/log.txt?x=12f62690f00000

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+b563d33852b893653a9e@syzkaller.appspotmail.com
Fixes: da0efe309444 ("mm: memcontrol: move memcg_online_kmem() to mem_cgroup_css_online()")

==================================================================
BUG: KASAN: use-after-free in cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138
Read of size 8 at addr ffff88806f06c6f0 by task kworker/u4:0/8

CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.18.0-rc1-syzkaller-00016-g3e732ebf7316 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: netns cleanup_net
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
print_address_description.constprop.0.cold+0xeb/0x495 mm/kasan/report.c:313
print_report mm/kasan/report.c:429 [inline]
kasan_report.cold+0xf4/0x1c6 mm/kasan/report.c:491
cfusbl_device_notify+0x7c9/0x870 net/caif/caif_usb.c:138
notifier_call_chain+0xb5/0x200 kernel/notifier.c:84
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1938
call_netdevice_notifiers_extack net/core/dev.c:1976 [inline]
call_netdevice_notifiers net/core/dev.c:1990 [inline]
netdev_wait_allrefs_any net/core/dev.c:10141 [inline]
netdev_run_todo+0xb90/0x10b0 net/core/dev.c:10253
default_device_exit_batch+0x44e/0x590 net/core/dev.c:11246
ops_exit_list+0x125/0x170 net/core/net_namespace.c:167
cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298
</TASK>

Allocated by task 3622:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track mm/kasan/common.c:45 [inline]
set_alloc_info mm/kasan/common.c:436 [inline]
____kasan_kmalloc mm/kasan/common.c:515 [inline]
____kasan_kmalloc mm/kasan/common.c:474 [inline]
__kasan_kmalloc+0xa9/0xd0 mm/kasan/common.c:524
kmalloc_node include/linux/slab.h:604 [inline]
kvmalloc_node+0x3e/0x130 mm/util.c:580
kvmalloc include/linux/slab.h:731 [inline]
kvzalloc include/linux/slab.h:739 [inline]
alloc_netdev_mqs+0x98/0x1100 net/core/dev.c:10495
rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3204
veth_newlink+0x20e/0xa90 drivers/net/veth.c:1748
__rtnl_newlink+0x107f/0x1760 net/core/rtnetlink.c:3483
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5990
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
netlink_sendmsg+0x904/0xe00 net/netlink/af_netlink.c:1921
sock_sendmsg_nosec net/socket.c:705 [inline]
sock_sendmsg+0xcf/0x120 net/socket.c:725
__sys_sendto+0x216/0x310 net/socket.c:2040
__do_sys_sendto net/socket.c:2052 [inline]
__se_sys_sendto net/socket.c:2048 [inline]
__x64_sys_sendto+0xdd/0x1b0 net/socket.c:2048
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x44/0xae

Freed by task 8:
kasan_save_stack+0x1e/0x40 mm/kasan/common.c:38
kasan_set_track+0x21/0x30 mm/kasan/common.c:45
kasan_set_free_info+0x20/0x30 mm/kasan/generic.c:370
____kasan_slab_free mm/kasan/common.c:366 [inline]
____kasan_slab_free+0x166/0x1a0 mm/kasan/common.c:328
kasan_slab_free include/linux/kasan.h:200 [inline]
slab_free_hook mm/slub.c:1728 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1754
slab_free mm/slub.c:3510 [inline]
kfree+0xd6/0x4d0 mm/slub.c:4552
kvfree+0x42/0x50 mm/util.c:615
device_release+0x9f/0x240 drivers/base/core.c:2229
kobject_cleanup lib/kobject.c:705 [inline]
kobject_release lib/kobject.c:736 [inline]
kref_put include/linux/kref.h:65 [inline]
kobject_put+0x1c8/0x540 lib/kobject.c:753
netdev_run_todo+0x72e/0x10b0 net/core/dev.c:10274
default_device_exit_batch+0x44e/0x590 net/core/dev.c:11246
ops_exit_list+0x125/0x170 net/core/net_namespace.c:167
cleanup_net+0x4ea/0xb00 net/core/net_namespace.c:594
process_one_work+0x996/0x1610 kernel/workqueue.c:2289
worker_thread+0x665/0x1080 kernel/workqueue.c:2436
kthread+0x2e9/0x3a0 kernel/kthread.c:376
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

The buggy address belongs to the object at ffff88806f06c000
which belongs to the cache kmalloc-cg-4k of size 4096
The buggy address is located 1776 bytes inside of
4096-byte region [ffff88806f06c000, ffff88806f06d000)

The buggy address belongs to the physical page:
page:ffffea0001bc1a00 refcount:1 mapcount:0 mapping:0000000000000000 index:0xffff88806f06e000 pfn:0x6f068
head:ffffea0001bc1a00 order:3 compound_mapcount:0 compound_pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffffea0001f2b208 ffffea00007afe08 ffff888010c4c280
raw: ffff88806f06e000 0000000000040003 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 3, migratetype Unmovable, gfp_mask 0xd60c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_RETRY_MAYFAIL|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 3621, tgid 3621 (syz-executor592), ts 165436873089, free_ts 9690486452
prep_new_page mm/page_alloc.c:2441 [inline]
get_page_from_freelist+0xba2/0x3df0 mm/page_alloc.c:4182
__alloc_pages+0x1b2/0x500 mm/page_alloc.c:5408
alloc_pages+0x1aa/0x310 mm/mempolicy.c:2262
alloc_slab_page mm/slub.c:1799 [inline]
allocate_slab+0x26c/0x3c0 mm/slub.c:1944
new_slab mm/slub.c:2004 [inline]
___slab_alloc+0x8df/0xf20 mm/slub.c:3005
__slab_alloc.constprop.0+0x4d/0xa0 mm/slub.c:3092
slab_alloc_node mm/slub.c:3183 [inline]
__kmalloc_node+0x2cb/0x390 mm/slub.c:4458
kmalloc_node include/linux/slab.h:604 [inline]
kvmalloc_node+0x3e/0x130 mm/util.c:580
kvmalloc include/linux/slab.h:731 [inline]
kvzalloc include/linux/slab.h:739 [inline]
alloc_netdev_mqs+0x98/0x1100 net/core/dev.c:10495
rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3204
veth_newlink+0x20e/0xa90 drivers/net/veth.c:1748
__rtnl_newlink+0x107f/0x1760 net/core/rtnetlink.c:3483
rtnl_newlink+0x64/0xa0 net/core/rtnetlink.c:3531
rtnetlink_rcv_msg+0x413/0xb80 net/core/rtnetlink.c:5990
netlink_rcv_skb+0x153/0x420 net/netlink/af_netlink.c:2496
netlink_unicast_kernel net/netlink/af_netlink.c:1319 [inline]
netlink_unicast+0x543/0x7f0 net/netlink/af_netlink.c:1345
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1356 [inline]
free_pcp_prepare+0x549/0xd20 mm/page_alloc.c:1406
free_unref_page_prepare mm/page_alloc.c:3328 [inline]
free_unref_page+0x19/0x690 mm/page_alloc.c:3423
free_contig_range+0xb1/0x180 mm/page_alloc.c:9418
destroy_args+0xa8/0x646 mm/debug_vm_pgtable.c:1018
debug_vm_pgtable+0x2a50/0x2ae2 mm/debug_vm_pgtable.c:1332
do_one_initcall+0x103/0x650 init/main.c:1298
do_initcall_level init/main.c:1371 [inline]
do_initcalls init/main.c:1387 [inline]
do_basic_setup init/main.c:1406 [inline]
kernel_init_freeable+0x6b1/0x73a init/main.c:1613
kernel_init+0x1a/0x1d0 init/main.c:1502
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298

Memory state around the buggy address:
ffff88806f06c580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806f06c600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88806f06c680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88806f06c700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88806f06c780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================

---
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