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BUG: KASAN: slab-out-of-bounds in vsscanf+0x2666/0x2ef0 lib/vsprintf.c:3321
Read of size 1 at addr ffff888052ce0472 by task syz-executor.3/26354

CPU: 0 PID: 26354 Comm: syz-executor.3 Not tainted 5.7.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1e9/0x30e lib/dump_stack.c:118
 print_address_description+0x66/0x5a0 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 vsscanf+0x2666/0x2ef0 lib/vsprintf.c:3321
 sscanf+0x6c/0x90 lib/vsprintf.c:3527
 smk_set_cipso+0x374/0x6c0 security/smack/smackfs.c:908
 __vfs_write+0x9c/0x6e0 fs/read_write.c:495
 vfs_write+0x274/0x580 fs/read_write.c:559
 ksys_write+0x11b/0x220 fs/read_write.c:612
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45ca69
Code: 0d b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 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 0f 83 db b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f10e6b56c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 000000000050d900 RCX: 000000000045ca69
RDX: 0000000000000071 RSI: 00000000200000c0 RDI: 0000000000000003
RBP: 000000000078bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000d20 R14: 00000000004cf7ab R15: 00007f10e6b576d4

Allocated by task 26354:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x103/0x140 mm/kasan/common.c:494
 __do_kmalloc mm/slab.c:3656 [inline]
 __kmalloc_track_caller+0x249/0x320 mm/slab.c:3671
 memdup_user_nul+0x26/0xf0 mm/util.c:259
 smk_set_cipso+0xff/0x6c0 security/smack/smackfs.c:859
 __vfs_write+0x9c/0x6e0 fs/read_write.c:495
 vfs_write+0x274/0x580 fs/read_write.c:559
 ksys_write+0x11b/0x220 fs/read_write.c:612
 do_syscall_64+0xf3/0x1b0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3

Freed by task 6001:
 save_stack mm/kasan/common.c:48 [inline]
 set_track mm/kasan/common.c:56 [inline]
 kasan_set_free_info mm/kasan/common.c:316 [inline]
 __kasan_slab_free+0x114/0x170 mm/kasan/common.c:455
 __cache_free mm/slab.c:3426 [inline]
 kfree+0x10a/0x220 mm/slab.c:3757
 nf_conntrack_free net/netfilter/nf_conntrack_core.c:1557 [inline]
 destroy_conntrack+0x342/0x470 net/netfilter/nf_conntrack_core.c:628
 nf_conntrack_destroy+0x128/0x1b0 net/netfilter/core.c:600
 nf_conntrack_put include/linux/netfilter/nf_conntrack_common.h:34 [inline]
 nf_ct_put include/net/netfilter/nf_conntrack.h:162 [inline]
 nf_ct_gc_expired net/netfilter/nf_conntrack_core.c:722 [inline]
 gc_worker+0x69d/0xf90 net/netfilter/nf_conntrack_core.c:1401
 process_one_work+0x76e/0xfd0 kernel/workqueue.c:2268
 worker_thread+0xa7f/0x1450 kernel/workqueue.c:2414
 kthread+0x353/0x380 kernel/kthread.c:268
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:351

The buggy address belongs to the object at ffff888052ce0400
 which belongs to the cache kmalloc-128 of size 128
The buggy address is located 114 bytes inside of
 128-byte region [ffff888052ce0400, ffff888052ce0480)
The buggy address belongs to the page:
page:ffffea00014b3800 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0xfffe0000000200(slab)
raw: 00fffe0000000200 ffffea0002564088 ffffea0002435f08 ffff8880aa400700
raw: 0000000000000000 ffff888052ce0000 0000000100000010 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888052ce0300: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff888052ce0380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888052ce0400: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 02 fc
                                                             ^
 ffff888052ce0480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888052ce0500: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fc fc
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