do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 413 Comm: syz-executor.0 Not tainted 5.4.268-syzkaller-04870-gd0d34dcb02cc #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:nexthop_create_group net/ipv4/nexthop.c:1134 [inline]
RIP: 0010:nexthop_add net/ipv4/nexthop.c:1319 [inline]
RIP: 0010:rtm_new_nexthop+0x24d4/0x6ae0 net/ipv4/nexthop.c:1518
Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 20 e8 a5 1b d3 fd 48 8b 44 24 20 4c 89 30 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 7e 1b d3 fd 48 8b 44 24 20 49 89 06
RSP: 0018:ffff8881ef3bf0a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881f5c02a00
RBP: ffff8881ef3bf4b0 R08: ffffffff82469848 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 1ffff1103de77e2c
R13: 0000000000010001 R14: 0000000000000000 R15: 1ffff1103b84bb84
FS:  00007f7d73b6d6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d73b6cff8 CR3: 00000001efb55000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 rtnetlink_rcv_msg+0x983/0xc70 net/core/rtnetlink.c:5291
 netlink_rcv_skb+0x1d5/0x420 net/netlink/af_netlink.c:2481
 netlink_unicast_kernel net/netlink/af_netlink.c:1321 [inline]
 netlink_unicast+0x936/0xb20 net/netlink/af_netlink.c:1347
 netlink_sendmsg+0xa18/0xcf0 net/netlink/af_netlink.c:1915
 sock_sendmsg_nosec net/socket.c:638 [inline]
 __sock_sendmsg net/socket.c:650 [inline]
 ____sys_sendmsg+0x5ac/0x8f0 net/socket.c:2306
 ___sys_sendmsg net/socket.c:2360 [inline]
 __sys_sendmsg+0x28b/0x380 net/socket.c:2406
 do_syscall_64+0xca/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
Modules linked in:
---[ end trace f5f2c6dc8d852ef6 ]---
RIP: 0010:nexthop_create_group net/ipv4/nexthop.c:1134 [inline]
RIP: 0010:nexthop_add net/ipv4/nexthop.c:1319 [inline]
RIP: 0010:rtm_new_nexthop+0x24d4/0x6ae0 net/ipv4/nexthop.c:1518
Code: 00 80 3c 01 00 74 0a 48 8b 7c 24 20 e8 a5 1b d3 fd 48 8b 44 24 20 4c 89 30 4c 89 f0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df <80> 3c 08 00 74 08 4c 89 f7 e8 7e 1b d3 fd 48 8b 44 24 20 49 89 06
RSP: 0018:ffff8881ef3bf0a0 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8881f5c02a00
RBP: ffff8881ef3bf4b0 R08: ffffffff82469848 R09: 0000000000000003
R10: ffffffffffffffff R11: dffffc0000000001 R12: 1ffff1103de77e2c
R13: 0000000000010001 R14: 0000000000000000 R15: 1ffff1103b84bb84
FS:  00007f7d73b6d6c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d73b6cff8 CR3: 00000001efb55000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 80 3c 01 00 74    	add    %al,0x7400013c(%rax)
   6:	0a 48 8b             	or     -0x75(%rax),%cl
   9:	7c 24                	jl     0x2f
   b:	20 e8                	and    %ch,%al
   d:	a5                   	movsl  %ds:(%rsi),%es:(%rdi)
   e:	1b d3                	sbb    %ebx,%edx
  10:	fd                   	std
  11:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
  16:	4c 89 30             	mov    %r14,(%rax)
  19:	4c 89 f0             	mov    %r14,%rax
  1c:	48 c1 e8 03          	shr    $0x3,%rax
  20:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  27:	fc ff df
* 2a:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 f7             	mov    %r14,%rdi
  33:	e8 7e 1b d3 fd       	call   0xfdd31bb6
  38:	48 8b 44 24 20       	mov    0x20(%rsp),%rax
  3d:	49 89 06             	mov    %rax,(%r14)