Oops: general protection fault, probably for non-canonical address 0xdffffc0000000083: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000418-0x000000000000041f]
CPU: 0 UID: 0 PID: 18137 Comm: syz.2.3040 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 ab 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 8c 82 19 f8 4d 8b 24 24 e8 e3 63
RSP: 0018:ffffc90021d4f470 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff88812941fe20 RCX: 0000000000000002
RDX: ffff888106759cc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88812941fe37 R08: 0000000000000000 R09: ffffffff8a0fa4af
R10: 0000000000000008 R11: 0000000000000002 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11025283fc6
FS:  00007f55d8df66c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c396cbc CR3: 000000012645c000 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
 tcp_v4_connect+0x751/0x1a00
 mptcp_connect+0x56b/0x830
 __inet_stream_connect+0x2ae/0xe80
 inet_stream_connect+0x66/0xa0
 __sys_connect+0x316/0x440
 __x64_sys_connect+0x7a/0x90
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f55dab8ec29
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:00007f55d8df6038 EFLAGS: 00000246 ORIG_RAX: 000000000000002a
RAX: ffffffffffffffda RBX: 00007f55dadd5fa0 RCX: 00007f55dab8ec29
RDX: 0000000000000010 RSI: 0000200000000000 RDI: 0000000000000009
RBP: 00007f55dac11e41 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f55dadd6038 R14: 00007f55dadd5fa0 R15: 00007ffe03cab208
 </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 ab 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 8c 82 19 f8 4d 8b 24 24 e8 e3 63
RSP: 0018:ffffc90021d4f470 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff88812941fe20 RCX: 0000000000000002
RDX: ffff888106759cc0 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff88812941fe37 R08: 0000000000000000 R09: ffffffff8a0fa4af
R10: 0000000000000008 R11: 0000000000000002 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11025283fc6
FS:  00007f55d8df66c0(0000) GS:ffff8880b8613000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffd55441eb8 CR3: 000000012645c000 CR4: 00000000000006f0
