syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000007: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]
CPU: 1 UID: 0 PID: 27375 Comm: syz.5.4295 Not tainted 6.13.0-rc5-syzkaller-00004-gccb98ccef0e5 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:sctp_copy_local_addr_list+0x2bc/0x5a0 net/sctp/protocol.c:142
Code: 20 00 0f 85 ac 02 00 00 48 8b 1b 4c 39 fb 0f 84 98 01 00 00 e8 d5 ce 3c f7 48 8d 7b 3d 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 20 38 d0 7f 08 84 c0 0f 85 86 02 00 00 44 0f b6 6b 3d
RSP: 0018:ffffc9000d057a40 EFLAGS: 00010206
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffc90018200000
RDX: 0000000000000005 RSI: ffffffff8a5c80eb RDI: 000000000000003d
RBP: ffffc9000d057b20 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000003f3aaaaafe R12: dffffc0000000000
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff888034d66a88
FS:  00007fd96be6b6c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b331f1ff8 CR3: 000000005c9f6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 sctp_copy_one_addr net/sctp/bind_addr.c:466 [inline]
 sctp_bind_addr_copy+0xe0/0x530 net/sctp/bind_addr.c:56
 sctp_connect_new_asoc+0x1d8/0x790 net/sctp/socket.c:1095
 __sctp_connect+0x3f5/0xc60 net/sctp/socket.c:1197
 sctp_connect net/sctp/socket.c:4819 [inline]
 sctp_inet_connect+0x15f/0x200 net/sctp/socket.c:4834
 __sys_connect_file+0x13e/0x1a0 net/socket.c:2055
 __sys_connect+0x14f/0x170 net/socket.c:2074
 __do_sys_connect net/socket.c:2080 [inline]
 __se_sys_connect net/socket.c:2077 [inline]
 __x64_sys_connect+0x72/0xb0 net/socket.c:2077
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fd96af85d29
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:00007fd96be6b038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007fd96b175fa0 RCX: 00007fd96af85d29
RDX: 0000000000000055 RSI: 00000000200018c0 RDI: 0000000000000003
RBP: 00007fd96b001b08 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007fd96b175fa0 R15: 00007ffc8fe46958
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:sctp_copy_local_addr_list+0x2bc/0x5a0 net/sctp/protocol.c:142
Code: 20 00 0f 85 ac 02 00 00 48 8b 1b 4c 39 fb 0f 84 98 01 00 00 e8 d5 ce 3c f7 48 8d 7b 3d 48 89 f8 48 89 fa 48 c1 e8 03 83 e2 07 <42> 0f b6 04 20 38 d0 7f 08 84 c0 0f 85 86 02 00 00 44 0f b6 6b 3d
RSP: 0018:ffffc9000d057a40 EFLAGS: 00010206
RAX: 0000000000000007 RBX: 0000000000000000 RCX: ffffc90018200000
RDX: 0000000000000005 RSI: ffffffff8a5c80eb RDI: 000000000000003d
RBP: ffffc9000d057b20 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000003f3aaaaafe R12: dffffc0000000000
R13: 0000000000000000 R14: 00000000ffffffff R15: ffff888034d66a88
FS:  00007fd96be6b6c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b331ebff8 CR3: 000000005c9f6000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	20 00                	and    %al,(%rax)
   2:	0f 85 ac 02 00 00    	jne    0x2b4
   8:	48 8b 1b             	mov    (%rbx),%rbx
   b:	4c 39 fb             	cmp    %r15,%rbx
   e:	0f 84 98 01 00 00    	je     0x1ac
  14:	e8 d5 ce 3c f7       	call   0xf73cceee
  19:	48 8d 7b 3d          	lea    0x3d(%rbx),%rdi
  1d:	48 89 f8             	mov    %rdi,%rax
  20:	48 89 fa             	mov    %rdi,%rdx
  23:	48 c1 e8 03          	shr    $0x3,%rax
  27:	83 e2 07             	and    $0x7,%edx
* 2a:	42 0f b6 04 20       	movzbl (%rax,%r12,1),%eax <-- trapping instruction
  2f:	38 d0                	cmp    %dl,%al
  31:	7f 08                	jg     0x3b
  33:	84 c0                	test   %al,%al
  35:	0f 85 86 02 00 00    	jne    0x2c1
  3b:	44 0f b6 6b 3d       	movzbl 0x3d(%rbx),%r13d