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SubjectRe: general protection fault in j1939_sk_sendmsg
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syzbot has bisected this bug to:

commit 9d71dd0c70099914fcd063135da3c580865e924c
Author: The j1939 authors <linux-can@vger.kernel.org>
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@syzkaller.appspotmail.com
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")

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

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