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BUG: KASAN: slab-out-of-bounds in find_first_zero_bit+0x84/0x90 lib/find_bit.c:105
Read of size 8 at addr ffff8880a98f3300 by task syz-executor.2/10008
CPU: 1 PID: 10008 Comm: syz-executor.2 Not tainted 4.14.307-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/16/2023
Call Trace:
__dump_stack lib/dump_stack.c:17 [inline]
dump_stack+0x1b2/0x281 lib/dump_stack.c:58
print_address_description.cold+0x54/0x1d3 mm/kasan/report.c:251
kasan_report_error.cold+0x8a/0x191 mm/kasan/report.c:350
kasan_report mm/kasan/report.c:408 [inline]
__asan_report_load8_noabort+0x68/0x70 mm/kasan/report.c:429
find_first_zero_bit+0x84/0x90 lib/find_bit.c:105
bfs_create+0xfb/0x620 fs/bfs/dir.c:92
lookup_open+0x77a/0x1750 fs/namei.c:3241
do_last fs/namei.c:3334 [inline]
path_openat+0xe08/0x2970 fs/namei.c:3571
do_filp_open+0x179/0x3c0 fs/namei.c:3605
do_sys_open+0x296/0x410 fs/open.c:1081
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
RIP: 0033:0x7f502bbac0f9
RSP: 002b:00007f502a11e168 EFLAGS: 00000246 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 00007f502bccbf80 RCX: 00007f502bbac0f9
RDX: 0000000000000000 RSI: 0000000000143142 RDI: 0000000020000240
RBP: 00007f502bc07ae9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd5ea26c9f R14: 00007f502a11e300 R15: 0000000000022000
Allocated by task 10008:
save_stack mm/kasan/kasan.c:447 [inline]
set_track mm/kasan/kasan.c:459 [inline]
kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:551
__do_kmalloc mm/slab.c:3720 [inline]
__kmalloc+0x15a/0x400 mm/slab.c:3729
kmalloc include/linux/slab.h:493 [inline]
kzalloc include/linux/slab.h:661 [inline]
bfs_fill_super+0x3d5/0xd80 fs/bfs/inode.c:363
mount_bdev+0x2b3/0x360 fs/super.c:1134
mount_fs+0x92/0x2a0 fs/super.c:1237
vfs_kern_mount.part.0+0x5b/0x470 fs/namespace.c:1046
vfs_kern_mount fs/namespace.c:1036 [inline]
do_new_mount fs/namespace.c:2572 [inline]
do_mount+0xe65/0x2a30 fs/namespace.c:2905
SYSC_mount fs/namespace.c:3121 [inline]
SyS_mount+0xa8/0x120 fs/namespace.c:3098
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
Freed by task 4622:
save_stack mm/kasan/kasan.c:447 [inline]
set_track mm/kasan/kasan.c:459 [inline]
kasan_slab_free+0xc3/0x1a0 mm/kasan/kasan.c:524
__cache_free mm/slab.c:3496 [inline]
kfree+0xc9/0x250 mm/slab.c:3815
aa_free_task_context+0xda/0x130 security/apparmor/context.c:54
apparmor_cred_free+0x34/0x70 security/apparmor/lsm.c:58
security_cred_free+0x71/0xb0 security/security.c:1003
put_cred_rcu+0xe3/0x300 kernel/cred.c:117
__put_cred+0x1a1/0x210 kernel/cred.c:151
put_cred include/linux/cred.h:274 [inline]
SYSC_faccessat fs/open.c:444 [inline]
SyS_faccessat+0x52a/0x680 fs/open.c:353
do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292
entry_SYSCALL_64_after_hwframe+0x5e/0xd3
The buggy address belongs to the object at ffff8880a98f3300
which belongs to the cache kmalloc-32 of size 32
The buggy address is located 0 bytes inside of
32-byte region [ffff8880a98f3300, ffff8880a98f3320)
The buggy address belongs to the page:
page:ffffea0002a63cc0 count:1 mapcount:0 mapping:ffff8880a98f3000 index:0xffff8880a98f3fc1
flags: 0xfff00000000100(slab)
raw: 00fff00000000100 ffff8880a98f3000 ffff8880a98f3fc1 000000010000003f
raw: ffffea0002a691a0 ffffea0002a68e60 ffff88813fe741c0 0000000000000000
page dumped because: kasan: bad access detected
Memory state around the buggy address:
ffff8880a98f3200: fb fb fb fb fc fc fc fc 00 00 fc fc fc fc fc fc
ffff8880a98f3280: fb fb fb fb fc fc fc fc 00 00 00 00 fc fc fc fc
>ffff8880a98f3300: 07 fc fc fc fc fc fc fc fb fb fb fb fc fc fc fc
^
ffff8880a98f3380: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
ffff8880a98f3400: fb fb fb fb fc fc fc fc fb fb fb fb fc fc fc fc
==================================================================
EXT4-fs (loop3): Unsupported blocksize for fs encryption