==================================================================
BUG: KASAN: slab-out-of-bounds in hiddev_ioctl_usage.isra.0+0x12d0/0x13b0 drivers/hid/usbhid/hiddev.c:522
Read of size 4 at addr ffff8881c19c8070 by task syz-executor747/382

CPU: 1 PID: 382 Comm: syz-executor747 Not tainted 5.6.0-rc7-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+0xef/0x16e lib/dump_stack.c:118
 print_address_description.constprop.0.cold+0xd3/0x314 mm/kasan/report.c:374
 __kasan_report.cold+0x37/0x77 mm/kasan/report.c:506
 kasan_report+0xe/0x20 mm/kasan/common.c:641
 hiddev_ioctl_usage.isra.0+0x12d0/0x13b0 drivers/hid/usbhid/hiddev.c:522
 hiddev_ioctl+0x7a1/0x1550 drivers/hid/usbhid/hiddev.c:794
 vfs_ioctl fs/ioctl.c:47 [inline]
 ksys_ioctl+0x11a/0x180 fs/ioctl.c:763
 __do_sys_ioctl fs/ioctl.c:772 [inline]
 __se_sys_ioctl fs/ioctl.c:770 [inline]
 __x64_sys_ioctl+0x6f/0xb0 fs/ioctl.c:770
 do_syscall_64+0xb6/0x5a0 arch/x86/entry/common.c:294
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x445189
Code: e8 ec b3 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 3b d4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff1e72e778 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004a6c70 RCX: 0000000000445189
RDX: 00000000200006c0 RSI: 00000000c018480b RDI: 0000000000000004
RBP: 00007fff1e72e780 R08: 8fce4d9635172f21 R09: 0000000120080522
R10: 000000000000000f R11: 0000000000000246 R12: 00000000004a6c70
R13: 0000000000402ae0 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0007066000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
flags: 0x200000000010000(head)
raw: 0200000000010000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881c19c7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881c19c7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881c19c8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fe fe
                                                             ^
 ffff8881c19c8080: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff8881c19c8100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
==================================================================