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BUG: KASAN: use-after-free in path_init+0x116b/0x13c0 fs/namei.c:2207
Read of size 8 at addr ffff888022a0e000 by task syz-executor.1/29177

CPU: 0 PID: 29177 Comm: syz-executor.1 Not tainted 5.8.0-next-20200812-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+0x18f/0x20d lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xae/0x497 mm/kasan/report.c:383
 __kasan_report mm/kasan/report.c:513 [inline]
 kasan_report.cold+0x1f/0x37 mm/kasan/report.c:530
 path_init+0x116b/0x13c0 fs/namei.c:2207
 path_parentat+0x22/0x1b0 fs/namei.c:2384
 filename_parentat+0x188/0x560 fs/namei.c:2407
 do_rmdir+0xa8/0x440 fs/namei.c:3738
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x45d189
Code: 5d b4 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 2b b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc059946c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000054
RAX: ffffffffffffffda RBX: 00000000000260c0 RCX: 000000000045d189
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000080
RBP: 000000000118cf70 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118cf4c
R13: 00007ffedb004a9f R14: 00007fc0599479c0 R15: 000000000118cf4c

Allocated by task 29177:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track mm/kasan/common.c:56 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:461
 slab_post_alloc_hook mm/slab.h:518 [inline]
 slab_alloc mm/slab.c:3312 [inline]
 kmem_cache_alloc+0x138/0x3a0 mm/slab.c:3482
 getname_flags.part.0+0x50/0x4f0 fs/namei.c:138
 getname_flags include/linux/audit.h:320 [inline]
 getname fs/namei.c:209 [inline]
 __do_sys_rmdir fs/namei.c:3789 [inline]
 __se_sys_rmdir fs/namei.c:3787 [inline]
 __x64_sys_rmdir+0xb1/0x100 fs/namei.c:3787
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

Freed by task 29177:
 kasan_save_stack+0x1b/0x40 mm/kasan/common.c:48
 kasan_set_track+0x1c/0x30 mm/kasan/common.c:56
 kasan_set_free_info+0x1b/0x30 mm/kasan/generic.c:355
 __kasan_slab_free+0xd8/0x120 mm/kasan/common.c:422
 __cache_free mm/slab.c:3418 [inline]
 kmem_cache_free.part.0+0x67/0x1f0 mm/slab.c:3693
 putname+0xe1/0x120 fs/namei.c:259
 do_rmdir+0x145/0x440 fs/namei.c:3779
 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9

The buggy address belongs to the object at ffff888022a0e000
 which belongs to the cache names_cache of size 4096
The buggy address is located 0 bytes inside of
 4096-byte region [ffff888022a0e000, ffff888022a0f000)
The buggy address belongs to the page:
page:00000000f1f4f875 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x22a0e
head:00000000f1f4f875 order:1 compound_mapcount:0
flags: 0xfffe0000010200(slab|head)
raw: 00fffe0000010200 ffffea000139df08 ffffea0001344608 ffff88821bc47a00
raw: 0000000000000000 ffff888022a0e000 0000000100000001 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff888022a0df00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff888022a0df80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff888022a0e000: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff888022a0e080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff888022a0e100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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