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BUG: KASAN: use-after-free in usbhid_power+0xca/0xe0 drivers/hid/usbhid/hid-core.c:1234
Read of size 8 at addr ffff8881c9f94008 by task syz-executor.1/6705

CPU: 1 PID: 6705 Comm: syz-executor.1 Not tainted 5.3.0+ #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+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:618
 usbhid_power+0xca/0xe0 drivers/hid/usbhid/hid-core.c:1234
 hid_hw_power include/linux/hid.h:1038 [inline]
 hidraw_open+0x20d/0x740 drivers/hid/hidraw.c:282
 chrdev_open+0x219/0x5c0 fs/char_dev.c:414
 do_dentry_open+0x494/0x1120 fs/open.c:797
 do_last fs/namei.c:3408 [inline]
 path_openat+0x1430/0x3f50 fs/namei.c:3525
 do_filp_open+0x1a1/0x280 fs/namei.c:3555
 do_sys_open+0x3c0/0x580 fs/open.c:1089
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x4138f1
Code: 75 14 b8 02 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 04 19 00 00 c3 48 83 ec 08 e8 0a fa ff ff 48 89 04 24 b8 02 00 00 00 0f 05 <48> 8b 3c 24 48 89 c2 e8 53 fa ff ff 48 89 d0 48 83 c4 08 48 3d 01
RSP: 002b:00007fab62ce87a0 EFLAGS: 00000293 ORIG_RAX: 0000000000000002
RAX: ffffffffffffffda RBX: 6666666666666667 RCX: 00000000004138f1
RDX: 0000000000000000 RSI: 0000000000000300 RDI: 00007fab62ce8850
RBP: 000000000075c1c0 R08: 000000000000000f R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000293 R12: 00007fab62ce96d4
R13: 00000000004c8df7 R14: 00000000004dff20 R15: 00000000ffffffff

Allocated by task 1609:
 save_stack+0x1b/0x80 mm/kasan/common.c:69
 set_track mm/kasan/common.c:77 [inline]
 __kasan_kmalloc mm/kasan/common.c:493 [inline]
 __kasan_kmalloc.constprop.0+0xbf/0xd0 mm/kasan/common.c:466
 kmalloc include/linux/slab.h:552 [inline]
 syslog_print kernel/printk/printk.c:1346 [inline]
 do_syslog kernel/printk/printk.c:1519 [inline]
 do_syslog+0x540/0x1380 kernel/printk/printk.c:1493
 kmsg_read+0x8a/0xb0 fs/proc/kmsg.c:40
 proc_reg_read+0x1c1/0x280 fs/proc/inode.c:223
 __vfs_read+0x76/0x100 fs/read_write.c:425
 vfs_read+0x1ea/0x430 fs/read_write.c:461
 ksys_read+0x127/0x250 fs/read_write.c:587
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 1609:
 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:455
 slab_free_hook mm/slub.c:1423 [inline]
 slab_free_freelist_hook mm/slub.c:1474 [inline]
 slab_free mm/slub.c:3016 [inline]
 kfree+0xe4/0x2f0 mm/slub.c:3957
 syslog_print kernel/printk/printk.c:1405 [inline]
 do_syslog kernel/printk/printk.c:1519 [inline]
 do_syslog+0x1098/0x1380 kernel/printk/printk.c:1493
 kmsg_read+0x8a/0xb0 fs/proc/kmsg.c:40
 proc_reg_read+0x1c1/0x280 fs/proc/inode.c:223
 __vfs_read+0x76/0x100 fs/read_write.c:425
 vfs_read+0x1ea/0x430 fs/read_write.c:461
 ksys_read+0x127/0x250 fs/read_write.c:587
 do_syscall_64+0xb7/0x580 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff8881c9f94000
 which belongs to the cache kmalloc-1k of size 1024
The buggy address is located 8 bytes inside of
 1024-byte region [ffff8881c9f94000, ffff8881c9f94400)
The buggy address belongs to the page:
page:ffffea000727e500 refcount:1 mapcount:0 mapping:ffff8881da002280 index:0x0 compound_mapcount: 0
flags: 0x200000000010200(slab|head)
raw: 0200000000010200 dead000000000100 dead000000000122 ffff8881da002280
raw: 0000000000000000 00000000000e000e 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff8881c9f93f00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff8881c9f93f80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff8881c9f94000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                      ^
 ffff8881c9f94080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff8881c9f94100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
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