general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 4801 Comm: syz.3.227 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:hidpp_match_answer drivers/hid/hid-logitech-hidpp.c:398 [inline]
RIP: 0010:hidpp_raw_hidpp_event+0x23d9/0x3420 drivers/hid/hid-logitech-hidpp.c:3589
Code: 8d 5c 24 02 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4d 89 ee 0f 85 1b 0f 00 00 44 0f b6 2b 49 8d 5f 02 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 19 0f 00 00 0f b6 03 0f b6 d8 44 89 ef
RSP: 0018:ffffc9000c8179c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888075958838
RBP: ffffc9000c817b00 R08: ffff88807595883f R09: 1ffff1100eb2b107
R10: dffffc0000000000 R11: ffffed100eb2b108 R12: ffff88807a06c0b6
R13: 0000000000000004 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f92781856c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b31663fff CR3: 000000002ba26000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 hidpp_raw_event+0x155/0x1740 drivers/hid/hid-logitech-hidpp.c:-1
 hid_input_report+0x3fe/0x4f0 drivers/hid/hid-core.c:1909
 uhid_dev_input2+0xb1/0x130 drivers/hid/uhid.c:611
 uhid_char_write+0x376/0xaf0 drivers/hid/uhid.c:769
 vfs_write+0x304/0xd70 fs/read_write.c:592
 ksys_write+0x153/0x260 fs/read_write.c:647
 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: 0033:0x7f9278b25019
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:00007f9278185028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9278dacfa0 RCX: 00007f9278b25019
RDX: 000000000000001a RSI: 0000200000000d00 RDI: 0000000000000003
RBP: 00007f9278bbc00c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9278dad038 R14: 00007f9278dacfa0 R15: 00007fffcc9b9f48
 </TASK>
Modules linked in:
---[ end trace a1d8aa87b35558f2 ]---
RIP: 0010:hidpp_match_answer drivers/hid/hid-logitech-hidpp.c:398 [inline]
RIP: 0010:hidpp_raw_hidpp_event+0x23d9/0x3420 drivers/hid/hid-logitech-hidpp.c:3589
Code: 8d 5c 24 02 48 89 d8 48 c1 e8 03 42 0f b6 04 28 84 c0 4d 89 ee 0f 85 1b 0f 00 00 44 0f b6 2b 49 8d 5f 02 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 0f 85 19 0f 00 00 0f b6 03 0f b6 d8 44 89 ef
RSP: 0018:ffffc9000c8179c0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000002 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888075958838
RBP: ffffc9000c817b00 R08: ffff88807595883f R09: 1ffff1100eb2b107
R10: dffffc0000000000 R11: ffffed100eb2b108 R12: ffff88807a06c0b6
R13: 0000000000000004 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f92781856c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b30663fff CR3: 000000002ba26000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	8d 5c 24 02          	lea    0x2(%rsp),%ebx
   4:	48 89 d8             	mov    %rbx,%rax
   7:	48 c1 e8 03          	shr    $0x3,%rax
   b:	42 0f b6 04 28       	movzbl (%rax,%r13,1),%eax
  10:	84 c0                	test   %al,%al
  12:	4d 89 ee             	mov    %r13,%r14
  15:	0f 85 1b 0f 00 00    	jne    0xf36
  1b:	44 0f b6 2b          	movzbl (%rbx),%r13d
  1f:	49 8d 5f 02          	lea    0x2(%r15),%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 19 0f 00 00    	jne    0xf50
  37:	0f b6 03             	movzbl (%rbx),%eax
  3a:	0f b6 d8             	movzbl %al,%ebx
  3d:	44 89 ef             	mov    %r13d,%edi