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BUG: KASAN: out-of-bounds in check_canary_byte mm/kfence/core.c:211 [inline]
BUG: KASAN: out-of-bounds in for_each_canary mm/kfence/core.c:245 [inline]
BUG: KASAN: out-of-bounds in kfence_guarded_free+0x7f1/0x8f0 mm/kfence/core.c:374
Read of size 1 at addr ffff88823bd3ec79 by task syz-executor.2/21841

CPU: 0 PID: 21841 Comm: syz-executor.2 Not tainted 5.10.0-next-20201223-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:79 [inline]
 dump_stack+0x107/0x163 lib/dump_stack.c:120
 print_address_description.constprop.0.cold+0x5b/0x2f8 mm/kasan/report.c:230
 __kasan_report mm/kasan/report.c:396 [inline]
 kasan_report.cold+0x79/0xd5 mm/kasan/report.c:413
 check_canary_byte mm/kfence/core.c:211 [inline]
 for_each_canary mm/kfence/core.c:245 [inline]
 kfence_guarded_free+0x7f1/0x8f0 mm/kfence/core.c:374
 __kfence_free+0x70/0x150 mm/kfence/core.c:756
 do_slab_free mm/slub.c:3145 [inline]
 slab_free mm/slub.c:3158 [inline]
 kfree+0x57c/0x5c0 mm/slub.c:4156
 skb_free_head net/core/skbuff.c:595 [inline]
 skb_release_data+0x6d9/0x910 net/core/skbuff.c:615
 skb_release_all net/core/skbuff.c:669 [inline]
 __kfree_skb net/core/skbuff.c:683 [inline]
 kfree_skb net/core/skbuff.c:701 [inline]
 kfree_skb+0x133/0x3f0 net/core/skbuff.c:695
 skb_queue_purge+0x14/0x30 net/core/skbuff.c:3086
 packet_release+0x75f/0xc90 net/packet/af_packet.c:3102
 __sock_release+0xcd/0x280 net/socket.c:597
 sock_close+0x18/0x20 net/socket.c:1256
 __fput+0x283/0x920 fs/file_table.c:280
 task_work_run+0xdd/0x190 kernel/task_work.c:140
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:174 [inline]
 exit_to_user_mode_prepare+0x249/0x250 kernel/entry/common.c:201
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x19/0x50 kernel/entry/common.c:302
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x417bf1
Code: 75 14 b8 03 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 a4 1a 00 00 c3 48 83 ec 08 e8 0a fc ff ff 48 89 04 24 b8 03 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fc ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007ffc0eb69900 EFLAGS: 00000293 ORIG_RAX: 0000000000000003
RAX: 0000000000000000 RBX: 0000000000000006 RCX: 0000000000417bf1
RDX: 0000000000000000 RSI: ffffffff88eed2be RDI: 0000000000000005
RBP: 0000000000000001 R08: ffffffff8132a984 R09: 00000000deefdb1b
R10: 00007ffc0eb699e0 R11: 0000000000000293 R12: 000000000119ca00
R13: 000000000119ca00 R14: 00000000000003e8 R15: 000000000119c034

Allocated by task 0:
(stack is not available)

The buggy address belongs to the object at ffff88823bd3e000
 which belongs to the cache kmalloc-2k of size 2048
The buggy address is located 1145 bytes to the right of
 2048-byte region [ffff88823bd3e000, ffff88823bd3e800)
The buggy address belongs to the page:
page:000000000f735b01 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x23bd3e
flags: 0x57ff00000001200(slab|reserved)
raw: 057ff00000001200 ffffea0008ef4f88 ffffea0008ef4f88 ffff888010042000
raw: 0000000000000000 0000000000010000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88823bd3eb00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88823bd3eb80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff88823bd3ec00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 01
                                                                ^
 ffff88823bd3ec80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff88823bd3ed00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
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