Re: general protection fault in j1939_sk_sendmsg

[syzbot]

syzbot has bisected this bug to:

commit 9d71dd0c70099914fcd063135da3c580865e924c
Author: The j1939 authors <linux-can@xxxxxxxxxxxxxxx>
Date:   Mon Oct 8 09:48:36 2018 +0000

    can: add support of SAE J1939 protocol

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15874852e00000
start commit:   a99d8080 Linux 5.4-rc6
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=17874852e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=13874852e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5e2eca3f31f9bf
dashboard link: https://syzkaller.appspot.com/bug?extid=7044ea77452b6f92b4fd
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=15a99e8ae00000

Reported-by: syzbot+7044ea77452b6f92b4fd@xxxxxxxxxxxxxxxxxxxxxxxxx
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection