==================================================================
BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
Read of size 8 at addr ffff8880a152f900 by task syz-executor.3/20788

CPU: 1 PID: 20788 Comm: syz-executor.3 Not tainted 4.19.211-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/21/2023
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1fc/0x2ef lib/dump_stack.c:118
 print_address_description.cold+0x54/0x219 mm/kasan/report.c:256
 kasan_report_error.cold+0x8a/0x1b9 mm/kasan/report.c:354
 kasan_report mm/kasan/report.c:412 [inline]
 __asan_report_load8_noabort+0x88/0x90 mm/kasan/report.c:433
 find_first_zero_bit+0xa8/0xb0 lib/find_bit.c:125
 bfs_create+0xfb/0x610 fs/bfs/dir.c:91
 vfs_create+0x461/0x6c0 fs/namei.c:2913
 do_mknodat.part.0+0x2ff/0x480 fs/namei.c:3768
 do_mknodat fs/namei.c:3795 [inline]
 __do_sys_mknod fs/namei.c:3797 [inline]
 __se_sys_mknod fs/namei.c:3795 [inline]
 __x64_sys_mknod+0xf8/0x120 fs/namei.c:3795
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7fb33cf670f9
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:00007fb33b4d9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000085
RAX: ffffffffffffffda RBX: 00007fb33d086f80 RCX: 00007fb33cf670f9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200001c0
RBP: 00007fb33cfc2ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff3a17a3cf R14: 00007fb33b4d9300 R15: 0000000000022000

Allocated by task 20788:
 __do_kmalloc mm/slab.c:3727 [inline]
 __kmalloc+0x15a/0x3c0 mm/slab.c:3736
 kmalloc include/linux/slab.h:520 [inline]
 kzalloc include/linux/slab.h:709 [inline]
 bfs_fill_super+0x447/0xec0 fs/bfs/inode.c:363
 mount_bdev+0x2fc/0x3b0 fs/super.c:1158
 mount_fs+0xa3/0x310 fs/super.c:1261
 vfs_kern_mount.part.0+0x68/0x470 fs/namespace.c:961
 vfs_kern_mount fs/namespace.c:951 [inline]
 do_new_mount fs/namespace.c:2492 [inline]
 do_mount+0x115c/0x2f50 fs/namespace.c:2822
 ksys_mount+0xcf/0x130 fs/namespace.c:3038
 __do_sys_mount fs/namespace.c:3052 [inline]
 __se_sys_mount fs/namespace.c:3049 [inline]
 __x64_sys_mount+0xba/0x150 fs/namespace.c:3049
 do_syscall_64+0xf9/0x620 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 8694:
 __cache_free mm/slab.c:3503 [inline]
 kfree+0xcc/0x210 mm/slab.c:3822
 batadv_tt_tvlv_container_update+0x1e2/0x780 net/batman-adv/translation-table.c:1077
 batadv_tt_local_commit_changes_nolock+0xc77/0xe30 net/batman-adv/translation-table.c:3941
 batadv_tt_local_commit_changes+0x22/0x30 net/batman-adv/translation-table.c:3969
 batadv_iv_ogm_schedule_buff+0x103c/0x1340 net/batman-adv/bat_iv_ogm.c:994
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1052 [inline]
 batadv_iv_ogm_schedule net/batman-adv/bat_iv_ogm.c:1045 [inline]
 batadv_iv_send_outstanding_bat_ogm_packet+0x68c/0x7a0 net/batman-adv/bat_iv_ogm.c:1871
 process_one_work+0x864/0x1570 kernel/workqueue.c:2153
 worker_thread+0x64c/0x1130 kernel/workqueue.c:2296
 kthread+0x33f/0x460 kernel/kthread.c:259
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:415

The buggy address belongs to the object at ffff8880a152f900
 which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
 32-byte region [ffff8880a152f900, ffff8880a152f920)
The buggy address belongs to the page:
page:ffffea0002854bc0 count:1 mapcount:0 mapping:ffff88813bff01c0 index:0xffff8880a152ffc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffffea0002c2f288 ffffea0002cf4bc8 ffff88813bff01c0
raw: ffff8880a152ffc1 ffff8880a152f000 000000010000003f 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a152f800: 00 00 fc fc fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a152f880: 00 00 00 02 fc fc fc fc fb fb fb fb fc fc fc fc
>ffff8880a152f900: 07 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
                   ^
 ffff8880a152f980: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
 ffff8880a152fa00: 00 00 00 02 fc fc fc fc 00 04 fc fc fc fc fc fc
==================================================================
FS-Cache: Duplicate cookie detected
FS-Cache: O-cookie c=000000006e999447 [p=000000009e370a99 fl=222 nc=0 na=1]
FS-Cache: O-cookie d=0000000043618372 n=00000000bf9e4956
FS-Cache: O-key=[16] '02000000000000000200010073680000'
FS-Cache: N-cookie c=0000000030391e5c [p=000000009e370a99 fl=2 nc=0 na=1]
FS-Cache: N-cookie d=0000000043618372 n=0000000099f9847c
FS-Cache: N-key=[16] '02000000000000000200010073680000'
XFS (loop4): Mounting V4 Filesystem
XFS (loop4): Ending clean mount
XFS (loop4): Quotacheck needed: Please wait.
XFS (loop4): Quotacheck: Done.
audit: type=1804 audit(1676646484.488:1906): pid=20776 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=invalid_pcr cause=open_writers comm="syz-executor.4" name="/root/syzkaller-testdir3243618026/syzkaller.P5PoEP/701/bus/bus" dev="loop4" ino=42 res=1
XFS (loop4): Unmounting Filesystem