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BUG: KASAN: use-after-free in strlen+0x79/0x90 lib/string.c:525
Read of size 1 at addr ffff8881ce8e1f10 by task syz-executor110/1985

CPU: 0 PID: 1985 Comm: syz-executor110 Not tainted 5.3.0-rc2+ #23
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+0xca/0x13e lib/dump_stack.c:113
 print_address_description+0x6a/0x32c mm/kasan/report.c:351
 __kasan_report.cold+0x1a/0x33 mm/kasan/report.c:482
 kasan_report+0xe/0x12 mm/kasan/common.c:612
 strlen+0x79/0x90 lib/string.c:525
 strlen include/linux/string.h:281 [inline]
 hidraw_ioctl+0x245/0xae0 drivers/hid/hidraw.c:446
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd2d/0x1330 fs/ioctl.c:696
 ksys_ioctl+0x9b/0xc0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:718
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x44dd09
Code: e8 ec d9 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 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 0b ca fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f7aca4f0ce8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000006e6a18 RCX: 000000000044dd09
RDX: 0000000020000100 RSI: 0000000080404805 RDI: 0000000000000003
RBP: 00000000006e6a10 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000006e6a1c
R13: 00007ffc656841cf R14: 00007f7aca4f19c0 R15: 0000000000000006

Allocated by task 1703:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:487 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:460
 slab_post_alloc_hook mm/slab.h:520 [inline]
 slab_alloc_node mm/slub.c:2766 [inline]
 slab_alloc mm/slub.c:2774 [inline]
 kmem_cache_alloc+0xd6/0x2d0 mm/slub.c:2779
 getname_flags fs/namei.c:138 [inline]
 getname_flags+0xd2/0x5b0 fs/namei.c:128
 user_path_at_empty+0x2a/0x50 fs/namei.c:2606
 user_path_at include/linux/namei.h:60 [inline]
 vfs_statx+0x113/0x1e0 fs/stat.c:187
 vfs_lstat include/linux/fs.h:3187 [inline]
 __do_sys_newlstat+0x96/0x120 fs/stat.c:354
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 1703:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_slab_free+0x130/0x180 mm/kasan/common.c:449
 slab_free_hook mm/slub.c:1423 [inline]
 slab_free_freelist_hook mm/slub.c:1470 [inline]
 slab_free mm/slub.c:3012 [inline]
 kmem_cache_free+0xb9/0x380 mm/slub.c:3028
 putname+0xe1/0x120 fs/namei.c:259
 filename_lookup+0x28f/0x410 fs/namei.c:2355
 user_path_at include/linux/namei.h:60 [inline]
 vfs_statx+0x113/0x1e0 fs/stat.c:187
 vfs_lstat include/linux/fs.h:3187 [inline]
 __do_sys_newlstat+0x96/0x120 fs/stat.c:354
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881ce8e1100
 which belongs to the cache names_cache of size 4096
The buggy address is located 3600 bytes inside of
 4096-byte region [ffff8881ce8e1100, ffff8881ce8e2100)
The buggy address belongs to the page:
page:ffffea00073a3800 refcount:1 mapcount:0 mapping:ffff8881da112000 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da112000
raw: 0000000000000000 0000000000070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881ce8e1e00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881ce8e1e80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff8881ce8e1f00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff8881ce8e1f80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881ce8e2000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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