BUG: KASAN: slab-out-of-bounds in hiddev_ioctl_usage+0x16f2/0x1830 drivers/hid/usbhid/hiddev.c:522
Read of size 4 at addr ffff8881cdcc8070 by task syz-executor146/393

CPU: 1 PID: 393 Comm: syz-executor146 Not tainted 5.4.35-syzkaller-00684-g954c82e77d8a #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+0x14a/0x1ce lib/dump_stack.c:118
 print_address_description+0x93/0x620 mm/kasan/report.c:374
 __kasan_report+0x16d/0x1e0 mm/kasan/report.c:506
 kasan_report+0x34/0x60 mm/kasan/common.c:634
 hiddev_ioctl_usage+0x16f2/0x1830 drivers/hid/usbhid/hiddev.c:522
 hiddev_ioctl+0x7a7/0x29a0 drivers/hid/usbhid/hiddev.c:794
 do_vfs_ioctl+0x770/0x1750 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:714 [inline]
 __do_sys_ioctl fs/ioctl.c:721 [inline]
 __se_sys_ioctl fs/ioctl.c:719 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:719
 do_syscall_64+0xcb/0x150 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x444bf9
Code: e8 bc af 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 1b d8 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007ffca28bc748 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00000000004002e0 RCX: 0000000000444bf9
RDX: 0000000020000040 RSI: 00000000c018480b RDI: 0000000000000004
RBP: 00000000006cf018 R08: 8fce4d9635172f21 R09: 00000000004002e0
R10: 000000000000000f R11: 0000000000000246 R12: 00000000004028a0
R13: 0000000000402930 R14: 0000000000000000 R15: 0000000000000000

The buggy address belongs to the page:
page:ffffea0007372000 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 compound_mapcount: 0
flags: 0x8000000000010000(head)
raw: 8000000000010000 dead000000000100 dead000000000122 0000000000000000
raw: 0000000000000000 0000000000000000 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881cdcc7f00: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 ffff8881cdcc7f80: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>ffff8881cdcc8000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 fe fe
                                                             ^
 ffff8881cdcc8080: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
 ffff8881cdcc8100: fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe fe
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