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BUG: KASAN: use-after-free in memcpy include/linux/fortify-string.h:191 [inline]
BUG: KASAN: use-after-free in __d_alloc+0x14c/0x870 fs/dcache.c:1775
Read of size 5 at addr ffff00000fa43320 by task kdevtmpfs/21

CPU: 0 PID: 21 Comm: kdevtmpfs Not tainted 5.14.0-syzkaller-11152-g78e709522d2c #0
Hardware name: linux,dummy-virt (DT)
Call trace:
 ptrauth_strip_insn_pac arch/arm64/include/asm/pointer_auth.h:102 [inline]
 dump_backtrace+0x0/0x3e0 arch/arm64/kernel/stacktrace.c:133
 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:215
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0x9c/0xd8 lib/dump_stack.c:106
 print_address_description.constprop.0+0x34/0x310 mm/kasan/report.c:256
 __kasan_report mm/kasan/report.c:442 [inline]
 kasan_report+0x1f4/0x210 mm/kasan/report.c:459
 check_region_inline mm/kasan/generic.c:173 [inline]
 kasan_check_range+0xfc/0x1a4 mm/kasan/generic.c:189
 memcpy+0x54/0x100 mm/kasan/shadow.c:65
 memcpy include/linux/fortify-string.h:191 [inline]
 __d_alloc+0x14c/0x870 fs/dcache.c:1775
 d_alloc+0x34/0x1c0 fs/dcache.c:1823
 __lookup_hash+0xa4/0x140 fs/namei.c:1554
 kern_path_locked+0x124/0x27c fs/namei.c:2567
 handle_remove+0x98/0x48c drivers/base/devtmpfs.c:312
 handle drivers/base/devtmpfs.c:382 [inline]
 devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline]
 devtmpfsd+0x158/0x22c drivers/base/devtmpfs.c:437
 kthread+0x334/0x3dc kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:756

Allocated by task 21:
 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38
 kasan_set_track mm/kasan/common.c:46 [inline]
 set_alloc_info mm/kasan/common.c:434 [inline]
 __kasan_slab_alloc+0x68/0x90 mm/kasan/common.c:467
 kasan_slab_alloc include/linux/kasan.h:254 [inline]
 slab_post_alloc_hook mm/slab.h:519 [inline]
 slab_alloc_node mm/slub.c:3206 [inline]
 slab_alloc mm/slub.c:3214 [inline]
 kmem_cache_alloc+0x3a8/0x570 mm/slub.c:3219
 getname_kernel+0x4c/0x2c0 fs/namei.c:226
 kern_path_locked+0x78/0x27c fs/namei.c:2558
 handle_remove+0x98/0x48c drivers/base/devtmpfs.c:312
 handle drivers/base/devtmpfs.c:382 [inline]
 devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline]
 devtmpfsd+0x158/0x22c drivers/base/devtmpfs.c:437
 kthread+0x334/0x3dc kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:756

Freed by task 21:
 kasan_save_stack+0x28/0x60 mm/kasan/common.c:38
 kasan_set_track+0x28/0x40 mm/kasan/common.c:46
 kasan_set_free_info+0x28/0x50 mm/kasan/generic.c:360
 ____kasan_slab_free mm/kasan/common.c:366 [inline]
 ____kasan_slab_free mm/kasan/common.c:328 [inline]
 __kasan_slab_free+0xfc/0x150 mm/kasan/common.c:374
 kasan_slab_free include/linux/kasan.h:230 [inline]
 slab_free_hook mm/slub.c:1700 [inline]
 slab_free_freelist_hook+0x90/0x234 mm/slub.c:1725
 slab_free mm/slub.c:3483 [inline]
 kmem_cache_free+0xc0/0x59c mm/slub.c:3499
 putname.part.0+0xc0/0x100 fs/namei.c:270
 putname include/linux/err.h:41 [inline]
 filename_parentat fs/namei.c:2547 [inline]
 kern_path_locked+0xb0/0x27c fs/namei.c:2558
 handle_remove+0x98/0x48c drivers/base/devtmpfs.c:312
 handle drivers/base/devtmpfs.c:382 [inline]
 devtmpfs_work_loop drivers/base/devtmpfs.c:395 [inline]
 devtmpfsd+0x158/0x22c drivers/base/devtmpfs.c:437
 kthread+0x334/0x3dc kernel/kthread.c:319
 ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:756

The buggy address belongs to the object at ffff00000fa43300
 which belongs to the cache names_cache of size 4096
The buggy address is located 32 bytes inside of
 4096-byte region [ffff00000fa43300, ffff00000fa44300)
The buggy address belongs to the page:
page:00000000493673c7 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x4fa40
head:00000000493673c7 order:3 compound_mapcount:0 compound_pincount:0
flags: 0x1ffc00000010200(slab|head|node=0|zone=0|lastcpupid=0x7ff)
raw: 01ffc00000010200 dead000000000100 dead000000000122 ffff000008d48480
raw: 0000000000000000 0000000080070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff00000fa43200: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff00000fa43280: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff00000fa43300: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                               ^
 ffff00000fa43380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff00000fa43400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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