==================================================================
BUG: KASAN: null-ptr-deref in mcp2221_raw_event+0xc1f/0x1030 drivers/hid/hid-mcp2221.c:910
Write of size 59 at addr 0000000000000000 by task udevd/2849
CPU: 1 UID: 0 PID: 2849 Comm: udevd Not tainted syzkaller #0 PREEMPT(voluntary)
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Call Trace:
__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+0x38b/0x610 drivers/usb/core/hcd.c:1661
usb_hcd_giveback_urb+0x39b/0x450 drivers/usb/core/hcd.c:1745
dummy_timer+0x1814/0x3a30 drivers/usb/gadget/udc/dummy_hcd.c:1995
__run_hrtimer kernel/time/hrtimer.c:1761 [inline]
__hrtimer_run_queues+0x1ff/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
asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data+0x11/0x90 kernel/kcov.c:246
Code: cc cc 0f 1f 80 00 00 00 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 49 89 d2 49 89 f8 49 89 f1 65 48 8b 15 37 7e 14 0b <65> 8b 05 48 7e 14 0b a9 00 01 ff 00 74 1d f6 c4 01 74 67 a9 00 00
RSP: 0018:ffffc900014bf7e8 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000078 RCX: ffffffff8288380b
RDX: ffff888116dbba00 RSI: 0000000000000000 RDI: 0000000000000001
RBP: 00007ffd4a9776d0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffc900014bfe58
R13: 0000000000000000 R14: ffffc900014bfe50 R15: 0000000000000000
copy_to_user_iter lib/iov_iter.c:20 [inline]
iterate_ubuf include/linux/iov_iter.h:30 [inline]
iterate_and_advance2 include/linux/iov_iter.h:302 [inline]
iterate_and_advance include/linux/iov_iter.h:330 [inline]
_copy_to_iter+0x2ab/0x1710 lib/iov_iter.c:185
copy_to_iter include/linux/uio.h:220 [inline]
simple_copy_to_iter+0x46/0x90 net/core/datagram.c:521
__skb_datagram_iter+0x129/0x900 net/core/datagram.c:402
skb_copy_datagram_iter+0x40/0x50 net/core/datagram.c:535
skb_copy_datagram_msg include/linux/skbuff.h:4167 [inline]
netlink_recvmsg+0x1e1/0x9c0 net/netlink/af_netlink.c:1953
sock_recvmsg_nosec net/socket.c:1065 [inline]
sock_recvmsg+0x1f6/0x250 net/socket.c:1087
____sys_recvmsg+0x218/0x6b0 net/socket.c:2834
___sys_recvmsg+0x114/0x1a0 net/socket.c:2876
__sys_recvmsg+0x16a/0x220 net/socket.c:2909
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: 0033:0x7f91a21c7407
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:00007ffd4a977580 EFLAGS: 00000202 ORIG_RAX: 000000000000002f
RAX: ffffffffffffffda RBX: 00007f91a20d9880 RCX: 00007f91a21c7407
RDX: 0000000000000000 RSI: 00007ffd4a977610 RDI: 0000000000000004
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000562763df4d80
R13: 00007ffd4a9776d0 R14: 00007ffd4a97761c R15: 0000000000000000
==================================================================
----------------
Code disassembly (best guess):
0: cc int3
1: cc int3
2: 0f 1f 80 00 00 00 00 nopl 0x0(%rax)
9: 90 nop
a: 90 nop
b: 90 nop
c: 90 nop
d: 90 nop
e: 90 nop
f: 90 nop
10: 90 nop
11: 90 nop
12: 90 nop
13: 90 nop
14: 90 nop
15: 90 nop
16: 90 nop
17: 90 nop
18: 90 nop
19: 49 89 d2 mov %rdx,%r10
1c: 49 89 f8 mov %rdi,%r8
1f: 49 89 f1 mov %rsi,%r9
22: 65 48 8b 15 37 7e 14 mov %gs:0xb147e37(%rip),%rdx # 0xb147e61
29: 0b
* 2a: 65 8b 05 48 7e 14 0b mov %gs:0xb147e48(%rip),%eax # 0xb147e79 <-- trapping instruction
31: a9 00 01 ff 00 test $0xff0100,%eax
36: 74 1d je 0x55
38: f6 c4 01 test $0x1,%ah
3b: 74 67 je 0xa4
3d: a9 .byte 0xa9