kernel BUG at net/phonet/socket.c:LINE!

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit:    b93cfb9c net: icmp6: do not select saddr from iif when rou..
git tree:       net
console output: https://syzkaller.appspot.com/x/log.txt?x=13501d2be00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=94a7f1dec460ee83
dashboard link: https://syzkaller.appspot.com/bug?extid=2dc91e7fc3dea88b1e8a
compiler:       gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+2dc91e7fc3dea88b1e8a@xxxxxxxxxxxxxxxxxxxxxxxxx

------------[ cut here ]------------
kernel BUG at net/phonet/socket.c:213!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 8394 Comm: syz-executor.4 Not tainted 5.6.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline]
RIP: 0010:pn_socket_autobind+0x13c/0x160 net/phonet/socket.c:202
Code: 44 05 00 00 00 00 00 44 89 e0 48 8b 4c 24 58 65 48 33 0c 25 28 00 00 00 75 23 48 83 c4 60 5b 5d 41 5c 41 5d c3 e8 b4 ad 41 fa <0f> 0b e8 9d 56 7f fa eb 9f e8 b6 56 7f fa e9 6d ff ff ff e8 0c dd
RSP: 0018:ffffc900034cfda8 EFLAGS: 00010212
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90011d66000
RDX: 0000000000000081 RSI: ffffffff873183dc RDI: 0000000000000003
RBP: 1ffff92000699fb5 R08: ffff8880620f61c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f84223c9700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000004d8730 CR3: 000000005cce0000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 pn_socket_listen+0x40/0x200 net/phonet/socket.c:399
 __sys_listen+0x17d/0x250 net/socket.c:1696
 __do_sys_listen net/socket.c:1705 [inline]
 __se_sys_listen net/socket.c:1703 [inline]
 __x64_sys_listen+0x50/0x70 net/socket.c:1703
 do_syscall_64+0xf6/0x7d0 arch/x86/entry/common.c:295
 entry_SYSCALL_64_after_hwframe+0x49/0xb3
RIP: 0033:0x45c889
Code: ad b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 7b b6 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f84223c8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000032
RAX: ffffffffffffffda RBX: 00007f84223c96d4 RCX: 000000000045c889
RDX: 0000000000000000 RSI: 000000000000007d RDI: 0000000000000003
RBP: 000000000076bf00 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 0000000000000712 R14: 00000000004c9e2d R15: 000000000076bf0c
Modules linked in:
---[ end trace 65d6f1331216c544 ]---
RIP: 0010:pn_socket_autobind net/phonet/socket.c:213 [inline]
RIP: 0010:pn_socket_autobind+0x13c/0x160 net/phonet/socket.c:202
Code: 44 05 00 00 00 00 00 44 89 e0 48 8b 4c 24 58 65 48 33 0c 25 28 00 00 00 75 23 48 83 c4 60 5b 5d 41 5c 41 5d c3 e8 b4 ad 41 fa <0f> 0b e8 9d 56 7f fa eb 9f e8 b6 56 7f fa e9 6d ff ff ff e8 0c dd
RSP: 0018:ffffc900034cfda8 EFLAGS: 00010212
RAX: 0000000000040000 RBX: 0000000000000000 RCX: ffffc90011d66000
RDX: 0000000000000081 RSI: ffffffff873183dc RDI: 0000000000000003
RBP: 1ffff92000699fb5 R08: ffff8880620f61c0 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f84223c9700(0000) GS:ffff8880ae600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000076c000 CR3: 000000005cce0000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400


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