==================================================================
BUG: KASAN: null-ptr-deref in mcp2221_raw_event+0xc1f/0x1030 drivers/hid/hid-mcp2221.c:910
Write of size 9 at addr 0000000000000000 by task syslogd/2827

CPU: 1 UID: 0 PID: 2827 Comm: syslogd Not tainted syzkaller #0 PREEMPT(voluntary) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 kasan_report+0xe0/0x110 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:183 [inline]
 kasan_check_range+0x100/0x1b0 mm/kasan/generic.c:189
 __asan_memcpy+0x3c/0x60 mm/kasan/shadow.c:106
 mcp2221_raw_event+0xc1f/0x1030 drivers/hid/hid-mcp2221.c:910
 __hid_input_report.constprop.0+0x314/0x450 drivers/hid/hid-core.c:2130
 hid_irq_in+0x35e/0x870 drivers/hid/usbhid/hid-core.c:286
 __usb_hcd_giveback_urb+0x38a/0x6e0 drivers/usb/core/hcd.c:1663
 usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1747
 dummy_timer+0x1814/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1995
 __run_hrtimer kernel/time/hrtimer.c:1761 [inline]
 __hrtimer_run_queues+0x202/0xad0 kernel/time/hrtimer.c:1825
 hrtimer_run_softirq+0x17d/0x350 kernel/time/hrtimer.c:1842
 handle_softirqs+0x208/0x8d0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0xfa/0x160 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0x90/0xb0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:__debug_check_no_obj_freed lib/debugobjects.c:1120 [inline]
RIP: 0010:debug_check_no_obj_freed+0x36a/0x600 lib/debugobjects.c:1129
Code: 24 48 48 39 f0 0f 85 ff fd ff ff 48 8b 5c 24 08 45 89 ee 44 3b 35 d2 e1 0e 08 7e 07 44 89 35 c9 e1 0e 08 0f b6 05 86 99 16 11 <84> c0 0f 85 14 fd ff ff 8b 05 e0 8d dd 06 85 c0 0f 84 06 fd ff ff
RSP: 0018:ffffc900014af7e0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 1ffff92000295f08 RCX: 0000000000000000
RDX: 0000000000000001 RSI: ffff8881366aa000 RDI: 0000000000000001
RBP: ffffc900014af910 R08: 0000000000000001 R09: 0000000000000001
R10: ffffffff8a9d65d7 R11: 0000000000000000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: ffff8881366a9c00
 slab_free_hook mm/slub.c:2348 [inline]
 slab_free mm/slub.c:4680 [inline]
 kfree+0x2d4/0x470 mm/slub.c:4879
 skb_kfree_head net/core/skbuff.c:1047 [inline]
 skb_free_head+0x114/0x210 net/core/skbuff.c:1059
 skb_release_data+0x795/0x9e0 net/core/skbuff.c:1086
 skb_release_all net/core/skbuff.c:1151 [inline]
 __kfree_skb net/core/skbuff.c:1165 [inline]
 consume_skb net/core/skbuff.c:1397 [inline]
 consume_skb+0xbf/0x100 net/core/skbuff.c:1391
 __unix_dgram_recvmsg+0x779/0xc30 net/unix/af_unix.c:2683
 unix_dgram_recvmsg+0xd0/0x110 net/unix/af_unix.c:2700
 sock_recvmsg_nosec net/socket.c:1065 [inline]
 sock_recvmsg+0x1f9/0x250 net/socket.c:1087
 sock_read_iter+0x2b9/0x3b0 net/socket.c:1157
 new_sync_read fs/read_write.c:491 [inline]
 vfs_read+0xa98/0xcf0 fs/read_write.c:572
 ksys_read+0x1f8/0x250 fs/read_write.c:715
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0x4b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6214c5f407
Code: 48 89 fa 4c 89 df e8 38 aa 00 00 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 1a 5b c3 0f 1f 84 00 00 00 00 00 48 8b 44 24 10 0f 05 <5b> c3 0f 1f 80 00 00 00 00 83 e2 39 83 fa 08 75 de e8 23 ff ff ff
RSP: 002b:00007ffd2fa3eab0 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00007f6214b0fc80 RCX: 00007f6214c5f407
RDX: 00000000000000ff RSI: 00005592b3760300 RDI: 0000000000000000
RBP: 00005592b37602c0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 00005592b376038f
R13: 0000000000000000 R14: 00005592b3760300 R15: 000055928e3b5d98
 </TASK>
==================================================================
----------------
Code disassembly (best guess):
   0:	24 48                	and    $0x48,%al
   2:	48 39 f0             	cmp    %rsi,%rax
   5:	0f 85 ff fd ff ff    	jne    0xfffffe0a
   b:	48 8b 5c 24 08       	mov    0x8(%rsp),%rbx
  10:	45 89 ee             	mov    %r13d,%r14d
  13:	44 3b 35 d2 e1 0e 08 	cmp    0x80ee1d2(%rip),%r14d        # 0x80ee1ec
  1a:	7e 07                	jle    0x23
  1c:	44 89 35 c9 e1 0e 08 	mov    %r14d,0x80ee1c9(%rip)        # 0x80ee1ec
  23:	0f b6 05 86 99 16 11 	movzbl 0x11169986(%rip),%eax        # 0x111699b0
* 2a:	84 c0                	test   %al,%al <-- trapping instruction
  2c:	0f 85 14 fd ff ff    	jne    0xfffffd46
  32:	8b 05 e0 8d dd 06    	mov    0x6dd8de0(%rip),%eax        # 0x6dd8e18
  38:	85 c0                	test   %eax,%eax
  3a:	0f 84 06 fd ff ff    	je     0xfffffd46