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SubjectRe: [syzbot] KASAN: use-after-free Read in snd_rawmidi_poll
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Hello,

syzbot has tested the proposed patch but the reproducer is still triggering an issue:
KASAN: use-after-free Read in io_poll_remove_entries

==================================================================
BUG: KASAN: use-after-free in __lock_acquire+0x3e7f/0x5660 kernel/locking/lockdep.c:4926
Read of size 8 at addr ffff88807e78e268 by task syz-executor.0/5598

CPU: 0 PID: 5598 Comm: syz-executor.0 Not tainted 6.2.0-rc3-next-20230112-syzkaller-dirty #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:88 [inline]
dump_stack_lvl+0xd1/0x138 lib/dump_stack.c:106
print_address_description mm/kasan/report.c:306 [inline]
print_report+0x15e/0x45d mm/kasan/report.c:417
kasan_report+0xc0/0xf0 mm/kasan/report.c:517
__lock_acquire+0x3e7f/0x5660 kernel/locking/lockdep.c:4926
lock_acquire.part.0+0x11a/0x350 kernel/locking/lockdep.c:5669
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:119 [inline]
_raw_spin_lock_irq+0x36/0x50 kernel/locking/spinlock.c:170
spin_lock_irq include/linux/spinlock.h:375 [inline]
io_poll_remove_entry io_uring/poll.c:183 [inline]
io_poll_remove_entries.part.0+0x15e/0x810 io_uring/poll.c:216
io_poll_remove_entries io_uring/poll.c:196 [inline]
io_poll_task_func+0x56c/0x1220 io_uring/poll.c:330
handle_tw_list+0xa8/0x460 io_uring/io_uring.c:1169
tctx_task_work+0x12e/0x530 io_uring/io_uring.c:1224
task_work_run+0x16f/0x270 kernel/task_work.c:179
get_signal+0x1c7/0x24f0 kernel/signal.c:2635
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f977d48c0c9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 f1 19 00 00 90 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f977e27c218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: fffffffffffffe00 RBX: 00007f977d5ac058 RCX: 00007f977d48c0c9
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f977d5ac058
RBP: 00007f977d5ac050 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f977d5ac05c
R13: 00007ffef7edfc4f R14: 00007f977e27c300 R15: 0000000000022000
</TASK>

Allocated by task 5596:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
____kasan_kmalloc mm/kasan/common.c:371 [inline]
____kasan_kmalloc mm/kasan/common.c:330 [inline]
__kasan_kmalloc+0xa2/0xb0 mm/kasan/common.c:380
kmalloc include/linux/slab.h:580 [inline]
kzalloc include/linux/slab.h:720 [inline]
snd_rawmidi_runtime_create sound/core/rawmidi.c:164 [inline]
open_substream+0xe9/0x8c0 sound/core/rawmidi.c:341
rawmidi_open_priv+0x591/0x6f0 sound/core/rawmidi.c:394
snd_rawmidi_open+0x467/0xb70 sound/core/rawmidi.c:492
snd_open+0x223/0x460 sound/core/sound.c:169
chrdev_open+0x26a/0x770 fs/char_dev.c:414
do_dentry_open+0x6cc/0x13f0 fs/open.c:883
do_open fs/namei.c:3558 [inline]
path_openat+0x1bc1/0x2b40 fs/namei.c:3715
do_filp_open+0x1ba/0x410 fs/namei.c:3742
do_sys_openat2+0x16d/0x4c0 fs/open.c:1311
do_sys_open fs/open.c:1327 [inline]
__do_sys_openat fs/open.c:1343 [inline]
__se_sys_openat fs/open.c:1338 [inline]
__x64_sys_openat+0x143/0x1f0 fs/open.c:1338
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Freed by task 5598:
kasan_save_stack+0x22/0x40 mm/kasan/common.c:45
kasan_set_track+0x25/0x30 mm/kasan/common.c:52
kasan_save_free_info+0x2e/0x40 mm/kasan/generic.c:518
____kasan_slab_free mm/kasan/common.c:236 [inline]
____kasan_slab_free+0x160/0x1c0 mm/kasan/common.c:200
kasan_slab_free include/linux/kasan.h:162 [inline]
slab_free_hook mm/slub.c:1781 [inline]
slab_free_freelist_hook+0x8b/0x1c0 mm/slub.c:1807
slab_free mm/slub.c:3787 [inline]
__kmem_cache_free+0xaf/0x2d0 mm/slub.c:3800
snd_rawmidi_runtime_free sound/core/rawmidi.c:192 [inline]
close_substream.part.0+0x21d/0x850 sound/core/rawmidi.c:570
close_substream sound/core/rawmidi.c:544 [inline]
rawmidi_release_priv+0x192/0x270 sound/core/rawmidi.c:587
snd_rawmidi_release+0x87/0x120 sound/core/rawmidi.c:624
__fput+0x27c/0xa90 fs/file_table.c:321
task_work_run+0x16f/0x270 kernel/task_work.c:179
get_signal+0x1c7/0x24f0 kernel/signal.c:2635
arch_do_signal_or_restart+0x79/0x5c0 arch/x86/kernel/signal.c:306
exit_to_user_mode_loop kernel/entry/common.c:168 [inline]
exit_to_user_mode_prepare+0x11f/0x240 kernel/entry/common.c:204
__syscall_exit_to_user_mode_work kernel/entry/common.c:286 [inline]
syscall_exit_to_user_mode+0x1d/0x50 kernel/entry/common.c:297
do_syscall_64+0x46/0xb0 arch/x86/entry/common.c:86
entry_SYSCALL_64_after_hwframe+0x63/0xcd

The buggy address belongs to the object at ffff88807e78e200
which belongs to the cache kmalloc-256 of size 256
The buggy address is located 104 bytes inside of
256-byte region [ffff88807e78e200, ffff88807e78e300)

The buggy address belongs to the physical page:
page:ffffea0001f9e380 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x7e78e
head:ffffea0001f9e380 order:1 entire_mapcount:0 nr_pages_mapped:0 pincount:0
flags: 0xfff00000010200(slab|head|node=0|zone=1|lastcpupid=0x7ff)
raw: 00fff00000010200 ffff888012441b40 dead000000000122 0000000000000000
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 1, migratetype Unmovable, gfp_mask 0x1d20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC|__GFP_HARDWALL), pid 5542, tgid 5542 (syz-executor.0), ts 112149922863, free_ts 109467087241
prep_new_page mm/page_alloc.c:2549 [inline]
get_page_from_freelist+0x11bb/0x2d50 mm/page_alloc.c:4324
__alloc_pages+0x1cb/0x5c0 mm/page_alloc.c:5590
alloc_pages+0x1aa/0x270 mm/mempolicy.c:2281
alloc_slab_page mm/slub.c:1851 [inline]
allocate_slab+0x25f/0x350 mm/slub.c:1998
new_slab mm/slub.c:2051 [inline]
___slab_alloc+0xa91/0x1400 mm/slub.c:3193
__slab_alloc.constprop.0+0x56/0xa0 mm/slub.c:3292
__slab_alloc_node mm/slub.c:3345 [inline]
slab_alloc_node mm/slub.c:3442 [inline]
__kmem_cache_alloc_node+0x136/0x330 mm/slub.c:3491
__do_kmalloc_node mm/slab_common.c:966 [inline]
__kmalloc+0x4a/0xd0 mm/slab_common.c:980
kmalloc include/linux/slab.h:584 [inline]
kzalloc include/linux/slab.h:720 [inline]
new_dir fs/proc/proc_sysctl.c:971 [inline]
get_subdir fs/proc/proc_sysctl.c:1015 [inline]
__register_sysctl_table+0x9ef/0x10a0 fs/proc/proc_sysctl.c:1366
mpls_dev_sysctl_register+0x1b7/0x2d0 net/mpls/af_mpls.c:1421
mpls_add_dev net/mpls/af_mpls.c:1472 [inline]
mpls_dev_notify+0x46d/0x990 net/mpls/af_mpls.c:1612
notifier_call_chain+0xb5/0x200 kernel/notifier.c:87
call_netdevice_notifiers_info+0xb5/0x130 net/core/dev.c:1944
call_netdevice_notifiers_extack net/core/dev.c:1982 [inline]
call_netdevice_notifiers net/core/dev.c:1996 [inline]
register_netdevice+0xfb4/0x1640 net/core/dev.c:10078
cfg80211_register_netdevice+0x157/0x330 net/wireless/core.c:1397
ieee80211_if_add+0x1073/0x1960 net/mac80211/iface.c:2198
page last free stack trace:
reset_page_owner include/linux/page_owner.h:24 [inline]
free_pages_prepare mm/page_alloc.c:1451 [inline]
free_pcp_prepare+0x4d0/0x910 mm/page_alloc.c:1501
free_unref_page_prepare mm/page_alloc.c:3387 [inline]
free_unref_page+0x1d/0x490 mm/page_alloc.c:3482
qlink_free mm/kasan/quarantine.c:168 [inline]
qlist_free_all+0x6a/0x170 mm/kasan/quarantine.c:187
kasan_quarantine_reduce+0x192/0x220 mm/kasan/quarantine.c:294
__kasan_slab_alloc+0x63/0x90 mm/kasan/common.c:302
kasan_slab_alloc include/linux/kasan.h:186 [inline]
slab_post_alloc_hook mm/slab.h:769 [inline]
slab_alloc_node mm/slub.c:3452 [inline]
slab_alloc mm/slub.c:3460 [inline]
__kmem_cache_alloc_lru mm/slub.c:3467 [inline]
kmem_cache_alloc+0x175/0x320 mm/slub.c:3476
getname_flags.part.0+0x50/0x4f0 fs/namei.c:140
getname_flags include/linux/audit.h:320 [inline]
getname+0x92/0xd0 fs/namei.c:219
do_sys_openat2+0xf5/0x4c0 fs/open.c:1305
do_sys_open fs/open.c:1327 [inline]
__do_sys_openat fs/open.c:1343 [inline]
__se_sys_openat fs/open.c:1338 [inline]
__x64_sys_openat+0x143/0x1f0 fs/open.c:1338
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x63/0xcd

Memory state around the buggy address:
ffff88807e78e100: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
ffff88807e78e180: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88807e78e200: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
^
ffff88807e78e280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
ffff88807e78e300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
==================================================================


Tested on:

commit: 0a093b28 Add linux-next specific files for 20230112
git tree: https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
console output: https://syzkaller.appspot.com/x/log.txt?x=140bcf4a480000
kernel config: https://syzkaller.appspot.com/x/.config?x=835f3591019836d5
dashboard link: https://syzkaller.appspot.com/bug?extid=e3ec01fd2d18c9264c3b
compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2
patch: https://syzkaller.appspot.com/x/patch.diff?x=117f933c480000

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