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: 22131 Comm: syz.3.11276 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 5b 6b 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 3c 6b 19 f8 4d 8b 24 24 e8 93 3c
RSP: 0018:ffffc9000354ecd0 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff8881077edf20 RCX: 0000000000000002
RDX: ffff88801f640000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881077edf37 R08: 0000000000000000 R09: ffffffff8a0fbbff
R10: 0000000000000008 R11: 0000000000000002 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11020efdbe6
FS:  00007f67306746c0(0000) GS:ffff8881a3c3d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6730673fc8 CR3: 00000000210e0000 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
 __inet_stream_connect+0x2ae/0xe80
 tcp_sendmsg_fastopen+0x3a7/0x5e0
 tcp_sendmsg_locked+0x4cc9/0x5540
 tcp_sendmsg+0x2f/0x50
 __sock_sendmsg+0x19c/0x270
 ____sys_sendmsg+0x52d/0x830
 ___sys_sendmsg+0x21f/0x2a0
 __sys_sendmmsg+0x227/0x430
 __x64_sys_sendmmsg+0xa0/0xc0
 do_syscall_64+0xfa/0x3b0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f672f78ec29
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:00007f6730674038 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f672f9d6090 RCX: 00007f672f78ec29
RDX: 0000000000000001 RSI: 00002000000005c0 RDI: 0000000000000009
RBP: 00007f672f811e41 R08: 0000000000000000 R09: 0000000000000000
R10: 000000002400c042 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f672f9d6128 R14: 00007f672f9d6090 R15: 00007fff6e764278
 </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 5b 6b 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 3c 6b 19 f8 4d 8b 24 24 e8 93 3c
RSP: 0018:ffffc9000354ecd0 EFLAGS: 00010202
RAX: 0000000000000083 RBX: ffff8881077edf20 RCX: 0000000000000002
RDX: ffff88801f640000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffff8881077edf37 R08: 0000000000000000 R09: ffffffff8a0fbbff
R10: 0000000000000008 R11: 0000000000000002 R12: 0000000000000418
R13: dffffc0000000000 R14: 0000000000000000 R15: 1ffff11020efdbe6
FS:  00007f67306746c0(0000) GS:ffff8880b863d000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563f4b2ed4e8 CR3: 00000000210e0000 CR4: 00000000000006f0
