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: 4407 Comm: syz.2.35 Not tainted 5.15.189-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025 RIP: 0010:mcp_smbus_xfer+0x59/0x1080 drivers/hid/hid-mcp2221.c:418 Code: c3 a8 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 76 6e 67 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 58 6e 67 fa 4c 8b 3b 4d 8d a7 70 RSP: 0018:ffffc900033ef9a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc900055d9000 RSI: 00000000000007dc RDI: 00000000000007dd RBP: 0000000000000005 R08: 0000000000000005 R09: 0000000000000007 R10: fffffbfff1ad2dd6 R11: 1ffffffff1ad2dd5 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000007 R15: dffffc0000000000 FS: 00007f81b136c6c0(0000) GS:ffff8880b9000000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b31e24218 CR3: 0000000060e73000 CR4: 00000000003506f0 Call Trace: __i2c_smbus_xfer+0x733/0x1d50 drivers/i2c/i2c-core-smbus.c:590 i2c_smbus_xfer+0x263/0x3a0 drivers/i2c/i2c-core-smbus.c:545 i2cdev_ioctl_smbus+0x3e3/0x650 drivers/i2c/i2c-dev.c:381 i2cdev_ioctl+0x545/0x750 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: 0033:0x7f81b3104be9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f81b136c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f81b332bfa0 RCX: 00007f81b3104be9 RDX: 0000200000000140 RSI: 0000000000000720 RDI: 0000000000000005 RBP: 00007f81b3187e19 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f81b332c038 R14: 00007f81b332bfa0 R15: 00007ffe8e8da6f8 Modules linked in: ---[ end trace 7dbe6d06d57ee755 ]--- RIP: 0010:mcp_smbus_xfer+0x59/0x1080 drivers/hid/hid-mcp2221.c:418 Code: c3 a8 01 00 00 48 89 d8 48 c1 e8 03 42 80 3c 38 00 74 08 48 89 df e8 76 6e 67 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 58 6e 67 fa 4c 8b 3b 4d 8d a7 70 RSP: 0018:ffffc900033ef9a0 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000080000 RDX: ffffc900055d9000 RSI: 00000000000007dc RDI: 00000000000007dd RBP: 0000000000000005 R08: 0000000000000005 R09: 0000000000000007 R10: fffffbfff1ad2dd6 R11: 1ffffffff1ad2dd5 R12: dffffc0000000000 R13: 0000000000000001 R14: 0000000000000007 R15: dffffc0000000000 FS: 00007f81b136c6c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fffbdea9ec0 CR3: 0000000060e73000 CR4: 00000000003506e0 ---------------- 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 76 6e 67 fa call 0xfa676e91 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 58 6e 67 fa call 0xfa676e91 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