general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 5058 Comm: syz.0.237 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:mcp_smbus_xfer+0x59/0x1070 drivers/hid/hid-mcp2221.c:443
Code: c3 a8 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 16 a0 55 fa 48 8b 1b 48 89 d8 48 c1 e8 03 48 89 44 24 08 <42> 80 3c 38 00 74 08 48 89 df e8 f8 9f 55 fa 4c 8b 3b 4d 8d a7 70
RSP: 0018:ffffc9000348f9a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000f4cc000 RSI: 000000000000040d RDI: 000000000000040e
RBP: 0000000000000006 R08: 0000000000000006 R09: 0000000000000005
R10: dffffc0000000000 R11: fffffbfff1b13c6e R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000005 R15: dffffc0000000000
FS:  00007f40f7c236c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000007000 CR3: 0000000056ddf000 CR4: 00000000003506f0
Call Trace:
 <TASK>
 __i2c_smbus_xfer+0x7b4/0x1dc0 drivers/i2c/i2c-core-smbus.c:590
 i2c_smbus_xfer+0x272/0x3b0 drivers/i2c/i2c-core-smbus.c:545
 i2cdev_ioctl_smbus+0x432/0x680 drivers/i2c/i2c-dev.c:381
 i2cdev_ioctl+0x583/0x7b0 drivers/i2c/i2c-dev.c:467
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:874 [inline]
 __se_sys_ioctl+0xfa/0x170 fs/ioctl.c:860
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f40f99ea799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f40f7c23028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f40f9c64090 RCX: 00007f40f99ea799
RDX: 0000200000000140 RSI: 0000000000000720 RDI: 000000000000000d
RBP: 00007f40f9a80bd9 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f40f9c64128 R14: 00007f40f9c64090 R15: 00007ffcda6e9d68
 </TASK>
Modules linked in:
---[ end trace 0c2261d3fd09d383 ]---
RIP: 0010:mcp_smbus_xfer+0x59/0x1070 drivers/hid/hid-mcp2221.c:443
Code: c3 a8 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 16 a0 55 fa 48 8b 1b 48 89 d8 48 c1 e8 03 48 89 44 24 08 <42> 80 3c 38 00 74 08 48 89 df e8 f8 9f 55 fa 4c 8b 3b 4d 8d a7 70
RSP: 0018:ffffc9000348f9a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc9000f4cc000 RSI: 000000000000040d RDI: 000000000000040e
RBP: 0000000000000006 R08: 0000000000000006 R09: 0000000000000005
R10: dffffc0000000000 R11: fffffbfff1b13c6e R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000005 R15: dffffc0000000000
FS:  00007f40f7c236c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c40365f CR3: 0000000056ddf000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c3                   	ret
   1:	a8 01                	test   $0x1,%al
   3:	00 00                	add    %al,(%rax)
   5:	48 89 d8             	mov    %rbx,%rax
   8:	48 c1 e8 03          	shr    $0x3,%rax
   c:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1)
  11:	74 08                	je     0x1b
  13:	48 89 df             	mov    %rbx,%rdi
  16:	e8 16 a0 55 fa       	call   0xfa55a031
  1b:	48 8b 1b             	mov    (%rbx),%rbx
  1e:	48 89 d8             	mov    %rbx,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	48 89 44 24 08       	mov    %rax,0x8(%rsp)
* 2a:	42 80 3c 38 00       	cmpb   $0x0,(%rax,%r15,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 f8 9f 55 fa       	call   0xfa55a031
  39:	4c 8b 3b             	mov    (%rbx),%r15
  3c:	4d                   	rex.WRB
  3d:	8d                   	.byte 0x8d
  3e:	a7                   	cmpsl  %es:(%rdi),%ds:(%rsi)
  3f:	70                   	.byte 0x70