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BUG: KASAN: use-after-free in path_init+0x59/0xf00 fs/namei.c:2207
Read of size 8 at addr ffff8880a0b10900 by task syz-executor.3/8191

CPU: 0 PID: 8191 Comm: syz-executor.3 Not tainted 5.8.0-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+0x1f0/0x31e lib/dump_stack.c:118
 print_address_description+0x66/0x620 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report+0x132/0x1d0 mm/kasan/report.c:530
 path_init+0x59/0xf00 fs/namei.c:2207
 path_parentat fs/namei.c:2384 [inline]
 filename_parentat+0x1a6/0xf50 fs/namei.c:2407
 do_rmdir+0x472/0x540 fs/namei.c:3732
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45ce69
Code: 2d b6 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 fb b5 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fcb81199c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00000000000260c0 RCX: 000000000045ce69
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000200000c0
RBP: 000000000118c090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118c06c
R13: 00007ffdb9df694f R14: 00007fcb8119a9c0 R15: 000000000118c06c

Allocated by task 8191:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc+0x100/0x130 mm/kasan/common.c:461
 slab_post_alloc_hook+0x3e/0x290 mm/slab.h:518
 slab_alloc mm/slab.c:3312 [inline]
 kmem_cache_alloc+0x1d2/0x2d0 mm/slab.c:3482
 getname_flags+0xb8/0x610 fs/namei.c:138
 getname fs/namei.c:209 [inline]
 __do_sys_rmdir fs/namei.c:3783 [inline]
 __se_sys_rmdir fs/namei.c:3781 [inline]
 __x64_sys_rmdir+0x38/0x50 fs/namei.c:3781
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 8191:
 kasan_save_stack mm/kasan/common.c:48 [inline]
 kasan_set_track+0x3d/0x70 mm/kasan/common.c:56
 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xdd/0x110 mm/kasan/common.c:422
 __cache_free mm/slab.c:3418 [inline]
 kmem_cache_free+0x79/0xf0 mm/slab.c:3693
 putname fs/namei.c:259 [inline]
 do_rmdir+0x40d/0x540 fs/namei.c:3773
 do_syscall_64+0x31/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff8880a0b10900
 which belongs to the cache names_cache of size 4096
The buggy address is located 0 bytes inside of
 4096-byte region [ffff8880a0b10900, ffff8880a0b11900)
The buggy address belongs to the page:
page:000000005a6c8529 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0xa0b10
head:000000005a6c8529 order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea00021d3a88 ffffea0002218a88 ffff8880aa643d00
raw: 0000000000000000 ffff8880a0b10900 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8880a0b10800: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8880a0b10880: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8880a0b10900: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff8880a0b10980: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8880a0b10a00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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