general protection fault, probably for non-canonical address 0xdffffc00000000c3: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000618-0x000000000000061f]
CPU: 1 PID: 4347 Comm: syz-executor.7 Not tainted 5.16.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:nfc_alloc_send_skb+0x3a/0x180
Code: 54 55 48 89 fd 53 4c 8d a5 18 06 00 00 48 89 f3 48 83 ec 08 e8 37 63 8c f8 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 0b 01 00 00 48 8d bd 1c 06 00
RSP: 0018:ffffc90007f47868 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88801ad5d000 RCX: 0000000000000000
RDX: 00000000000000c3 RSI: ffffffff88eac8f9 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90007f47920 R09: 0000000000000880
R10: ffffffff88ec5a44 R11: 000000000000087f R12: 0000000000000618
R13: ffffc90007f47920 R14: 0000000000000000 R15: 0000000000000082
FS:  00007fe56a19a6c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe56a19ad58 CR3: 000000006e00b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 nfc_llcp_send_ui_frame+0x27e/0x440
 llcp_sock_sendmsg+0x2b9/0x3a0
 sock_sendmsg+0xc9/0x120
 ____sys_sendmsg+0x261/0x800
 ___sys_sendmsg+0x100/0x170
 __sys_sendmmsg+0x194/0x440
 __x64_sys_sendmmsg+0x98/0x100
 do_syscall_64+0x34/0xb0
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7fe56ae3af69
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe56a19a0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007fe56af69050 RCX: 00007fe56ae3af69
RDX: 0000000000000006 RSI: 0000000020004540 RDI: 0000000000000004
RBP: 00007fe56ae874a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007fe56af69050 R15: 00007fffac48cee8
 </TASK>
Modules linked in:
---[ end trace 6451635e4ee3dab3 ]---
RIP: 0010:nfc_alloc_send_skb+0x3a/0x180
Code: 54 55 48 89 fd 53 4c 8d a5 18 06 00 00 48 89 f3 48 83 ec 08 e8 37 63 8c f8 4c 89 e2 48 b8 00 00 00 00 00 fc ff df 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 0b 01 00 00 48 8d bd 1c 06 00
RSP: 0018:ffffc90007f47868 EFLAGS: 00010206
RAX: dffffc0000000000 RBX: ffff88801ad5d000 RCX: 0000000000000000
RDX: 00000000000000c3 RSI: ffffffff88eac8f9 RDI: 0000000000000000
RBP: 0000000000000000 R08: ffffc90007f47920 R09: 0000000000000880
R10: ffffffff88ec5a44 R11: 000000000000087f R12: 0000000000000618
R13: ffffc90007f47920 R14: 0000000000000000 R15: 0000000000000082
FS:  00007fe56a19a6c0(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb5e99a6038 CR3: 000000006e00b000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	54                   	push   %rsp
   1:	55                   	push   %rbp
   2:	48 89 fd             	mov    %rdi,%rbp
   5:	53                   	push   %rbx
   6:	4c 8d a5 18 06 00 00 	lea    0x618(%rbp),%r12
   d:	48 89 f3             	mov    %rsi,%rbx
  10:	48 83 ec 08          	sub    $0x8,%rsp
  14:	e8 37 63 8c f8       	call   0xf88c6350
  19:	4c 89 e2             	mov    %r12,%rdx
  1c:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  23:	fc ff df
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	0f b6 04 02          	movzbl (%rdx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	74 08                	je     0x3a
  32:	3c 03                	cmp    $0x3,%al
  34:	0f 8e 0b 01 00 00    	jle    0x145
  3a:	48                   	rex.W
  3b:	8d                   	.byte 0x8d
  3c:	bd                   	.byte 0xbd
  3d:	1c 06                	sbb    $0x6,%al
