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BUG: KASAN: use-after-free in strlen+0x79/0x90 lib/string.c:525
Read of size 1 at addr ffff8881c8c71eb8 by task syz-executor068/3309

CPU: 1 PID: 3309 Comm: syz-executor068 Not tainted 5.3.0-rc5+ #28
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+0x62b/0xae0 drivers/hid/hidraw.c:437
 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: 0033:0x447529
Code: e8 4c e8 ff ff 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 fb cb fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffd7ff1c128 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000447529
RDX: 0000000000000000 RSI: 0000000080404804 RDI: 0000000000000005
RBP: 00007ffd7ff1c150 R08: 00007ffd7ff1c150 R09: 0000000000000000
R10: 00007ffd7ff1bc70 R11: 0000000000000246 R12: 0000000000106459
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0007231c40 refcount:0 mapcount:0 mapping:0000000000000000 index:0x0
flags: 0x200000000000000()
raw: 0200000000000000 0000000000000000 ffffffff07230201 0000000000000000
raw: 0000000000000000 0000000000000000 00000000ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881c8c71d80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c8c71e00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
>ffff8881c8c71e80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
                                        ^
 ffff8881c8c71f00: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
 ffff8881c8c71f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff
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