general protection fault, probably for non-canonical address 0xdffffc00000000c2: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000610-0x0000000000000617] CPU: 0 PID: 12325 Comm: syz-executor.0 Not tainted 5.16.0-rc7-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:nfc_alloc_send_skb+0x3a/0x190 net/nfc/core.c:722 Code: 54 41 89 d4 55 53 48 89 fb 48 8d ab 10 06 00 00 48 83 ec 08 e8 47 53 92 f8 48 89 ea 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 14 01 00 00 48 8d bb 14 06 00 RSP: 0018:ffffc90010c57888 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 00000000000000c2 RSI: ffffffff88e474b9 RDI: 0000000000000000 RBP: 0000000000000610 R08: ffffc90010c57938 R09: 0000000000000880 R10: ffffffff88e6031d R11: 000000000000087f R12: 0000000000000000 R13: 0000000000000082 R14: ffff88807c84c000 R15: ffffc90010c57938 FS: 00007fb25ae28700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f98c6afa1b8 CR3: 000000007c5c1000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: nfc_llcp_send_ui_frame+0x2c0/0x430 net/nfc/llcp_commands.c:759 llcp_sock_sendmsg+0x2b9/0x3a0 net/nfc/llcp_sock.c:803 sock_sendmsg_nosec net/socket.c:704 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:724 ____sys_sendmsg+0x331/0x810 net/socket.c:2409 ___sys_sendmsg+0xf3/0x170 net/socket.c:2463 __sys_sendmmsg+0x195/0x470 net/socket.c:2549 __do_sys_sendmmsg net/socket.c:2578 [inline] __se_sys_sendmmsg net/socket.c:2575 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2575 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fb25c4d3e99 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 bc ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fb25ae28168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fb25c5e7030 RCX: 00007fb25c4d3e99 RDX: 0000000000000006 RSI: 0000000020004540 RDI: 0000000000000005 RBP: 00007fb25c52dff1 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000040 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffdc4e9956f R14: 00007fb25ae28300 R15: 0000000000022000 Modules linked in: ---[ end trace 206c39a23b9b6eca ]--- RIP: 0010:nfc_alloc_send_skb+0x3a/0x190 net/nfc/core.c:722 Code: 54 41 89 d4 55 53 48 89 fb 48 8d ab 10 06 00 00 48 83 ec 08 e8 47 53 92 f8 48 89 ea 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 14 01 00 00 48 8d bb 14 06 00 RSP: 0018:ffffc90010c57888 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 00000000000000c2 RSI: ffffffff88e474b9 RDI: 0000000000000000 RBP: 0000000000000610 R08: ffffc90010c57938 R09: 0000000000000880 R10: ffffffff88e6031d R11: 000000000000087f R12: 0000000000000000 R13: 0000000000000082 R14: ffff88807c84c000 R15: ffffc90010c57938 FS: 00007fb25ae28700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000004 CR3: 000000007c5c1000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 ---------------- Code disassembly (best guess): 0: 54 push %rsp 1: 41 89 d4 mov %edx,%r12d 4: 55 push %rbp 5: 53 push %rbx 6: 48 89 fb mov %rdi,%rbx 9: 48 8d ab 10 06 00 00 lea 0x610(%rbx),%rbp 10: 48 83 ec 08 sub $0x8,%rsp 14: e8 47 53 92 f8 callq 0xf8925360 19: 48 89 ea mov %rbp,%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 14 01 00 00 jle 0x14e 3a: 48 rex.W 3b: 8d .byte 0x8d 3c: bb .byte 0xbb 3d: 14 06 adc $0x6,%al