Oops: general protection fault, probably for non-canonical address 0xdffffc0000000083: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000418-0x000000000000041f]
CPU: 1 UID: 0 PID: 12752 Comm: syz.1.1826 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
RIP: 0010:fib_lookup_good_nhc+0x85/0x3d0
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 6b 82 19 f8 41 bc 18 04 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 4c 82 19 f8 4d 8b 24 24 e8 a3 63
RSP: 0018:ffffc90009f5f1d0 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff888109036a20 RCX: 0000000000000000
RDX: ffff8881128dd640 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888109036a37 R08: 0000000000000000 R09: ffffffff8a0fa4ef
R10: 0000000000000008 R11: 0000000000000000 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11021206d46
FS:  00007fbbe863b6c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000000200 CR3: 0000000036aa8000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 nexthop_get_nhc_lookup+0x1af/0x400
 fib_table_lookup+0xf26/0x16e0
 fib4_rule_action+0x1fb/0x330
 fib_rules_lookup+0x8a6/0xe90
 __fib_lookup+0xf9/0x200
 ip_route_output_key_hash_rcu+0x31b/0x23e0
 ip_route_output_key_hash+0x174/0x280
 ip_route_output_flow+0x2a/0x150
 sctp_v4_get_dst+0x3c7/0x1200
 sctp_transport_route+0x118/0x2f0
 sctp_assoc_add_peer+0x657/0x13b0
 sctp_connect_new_asoc+0x30a/0x690
 __sctp_connect+0x5ba/0xd50
 sctp_getsockopt_connectx3+0x2c4/0x440
 sctp_getsockopt+0x98a/0xb60
 do_sock_getsockopt+0x372/0x450
 __x64_sys_getsockopt+0x1a5/0x250
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fbbe778ec29
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:00007fbbe863b038 EFLAGS: 00000246 ORIG_RAX: 0000000000000037
RAX: ffffffffffffffda RBX: 00007fbbe79d5fa0 RCX: 00007fbbe778ec29
RDX: 000000000000006f RSI: 0000000000000084 RDI: 0000000000000004
RBP: 00007fbbe7811e41 R08: 0000200000000140 R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fbbe79d6038 R14: 00007fbbe79d5fa0 R15: 00007ffe2faf2828
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:fib_lookup_good_nhc+0x85/0x3d0
Code: 4c 89 24 24 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 6b 82 19 f8 41 bc 18 04 00 00 4c 03 23 4c 89 e0 48 c1 e8 03 <42> 80 3c 28 00 74 08 4c 89 e7 e8 4c 82 19 f8 4d 8b 24 24 e8 a3 63
RSP: 0018:ffffc90009f5f1d0 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff888109036a20 RCX: 0000000000000000
RDX: ffff8881128dd640 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff888109036a37 R08: 0000000000000000 R09: ffffffff8a0fa4ef
R10: 0000000000000008 R11: 0000000000000000 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11021206d46
FS:  00007fbbe863b6c0(0000) GS:ffff8881a3c13000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555cc245c8 CR3: 0000000036aa8000 CR4: 00000000000006f0
