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BUG: KASAN: use-after-free in ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1516
Read of size 1 at addr ffff888120a44d0b by task syz-executor360/335

CPU: 0 PID: 335 Comm: syz-executor360 Not tainted 5.10.226-syzkaller-00709-ge5e5644ea27f #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack_lvl+0x1e2/0x24b lib/dump_stack.c:118
 print_address_description+0x81/0x3b0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:435 [inline]
 kasan_report+0x179/0x1c0 mm/kasan/report.c:452
 __asan_report_load1_noabort+0x14/0x20 mm/kasan/report_generic.c:306
 ext4_search_dir+0xf7/0x1b0 fs/ext4/namei.c:1516
 ext4_find_inline_entry+0x4b6/0x5e0 fs/ext4/inline.c:1700
 __ext4_find_entry+0x2b0/0x1990 fs/ext4/namei.c:1589
 ext4_lookup_entry fs/ext4/namei.c:1744 [inline]
 ext4_lookup+0x3c6/0xaa0 fs/ext4/namei.c:1812
 __lookup_slow+0x2b9/0x400 fs/namei.c:1640
 lookup_slow+0x5a/0x80 fs/namei.c:1657
 walk_component+0x48c/0x610 fs/namei.c:1952
 lookup_last fs/namei.c:2403 [inline]
 path_lookupat+0x16d/0x450 fs/namei.c:2427
 filename_lookup+0x26a/0x6f0 fs/namei.c:2460
 user_path_at_empty+0x40/0x50 fs/namei.c:2740
 user_path_at include/linux/namei.h:60 [inline]
 do_mount fs/namespace.c:3250 [inline]
 __do_sys_mount fs/namespace.c:3461 [inline]
 __se_sys_mount+0x285/0x3b0 fs/namespace.c:3438
 __x64_sys_mount+0xbf/0xd0 fs/namespace.c:3438
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f994dae1d19
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 81 1d 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f994da93218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f994db646e8 RCX: 00007f994dae1d19
RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000000
RBP: 00007f994db646e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f994db2ff4c
R13: 00007f994db2f7a0 R14: 0030656c69662f2e R15: 6f6f6c2f7665642f

The buggy address belongs to the page:
page:ffffea0004829100 refcount:0 mapcount:0 mapping:0000000000000000 index:0x1 pfn:0x120a44
flags: 0x4000000000000000()
raw: 4000000000000000 ffffea0004829148 ffffea00048290c8 0000000000000000
raw: 0000000000000001 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner info is not present (never set?)

Memory state around the buggy address:
 ffff888120a44c00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888120a44c80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff888120a44d00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                      ^
 ffff888120a44d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff888120a44e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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