linux-kernel - Re: general protection fault in j1939_netdev

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Date:   Wed, 11 Mar 2020 13:17:03 -0700
From:   syzbot <syzbot+f03d384f3455d28833eb@...kaller.appspotmail.com>
To:     a@...table.cc, b.a.t.m.a.n@...ts.open-mesh.org,
        davem@...emloft.net, jiri@...lanox.com, jiri@...nulli.us,
        kernel@...gutronix.de, kuba@...nel.org, linux-can@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux@...pel-privat.de,
        mareklindner@...mailbox.ch, mkl@...gutronix.de,
        netdev@...r.kernel.org, robin@...tonic.nl, socketcan@...tkopp.net,
        sven@...fation.org, sw@...onwunderlich.de,
        syzkaller-bugs@...glegroups.com
Subject: Re: general protection fault in j1939_netdev_start

syzbot has bisected this bug to:

commit 8330f73fe9742f201f467639f8356cf58756fb9f
Author: Jiri Pirko <jiri@...lanox.com>
Date:   Wed Sep 4 07:40:47 2019 +0000

    rocker: add missing init_net check in FIB notifier

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=165cdcb1e00000
start commit:   63623fd4 Merge tag 'for-linus' of git://git.kernel.org/pub..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=155cdcb1e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=115cdcb1e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=9833e26bab355358
dashboard link: https://syzkaller.appspot.com/bug?extid=f03d384f3455d28833eb
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=162b8331e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10f10a2de00000

Reported-by: syzbot+f03d384f3455d28833eb@...kaller.appspotmail.com
Fixes: 8330f73fe974 ("rocker: add missing init_net check in FIB notifier")

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