linux-kernel - Re: KASAN: use-after-free Read in j1939_session_get_by_addr

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Date:   Sun, 10 Nov 2019 19:57:01 -0800
From:   syzbot <syzbot+ca172a0ac477ac90f045@...kaller.appspotmail.com>
To:     bst@...gutronix.de, davem@...emloft.net,
        dev.kurt@...dijck-laurijssen.be, ecathinds@...il.com,
        kernel@...gutronix.de, linux-can@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux@...pel-privat.de,
        lkp@...el.com, maxime.jayat@...ile-devices.fr, mkl@...gutronix.de,
        netdev@...r.kernel.org, o.rempel@...gutronix.de, robin@...tonic.nl,
        socketcan@...tkopp.net, syzkaller-bugs@...glegroups.com
Subject: Re: KASAN: use-after-free Read in j1939_session_get_by_addr_locked

syzbot has bisected this bug to:

commit 9d71dd0c70099914fcd063135da3c580865e924c
Author: The j1939 authors <linux-can@...r.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=11bc06d6e00000
start commit:   00aff683 Merge tag 'for-5.4-rc6-tag' of git://git.kernel.o..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=13bc06d6e00000
console output: https://syzkaller.appspot.com/x/log.txt?x=15bc06d6e00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=8c5e2eca3f31f9bf
dashboard link: https://syzkaller.appspot.com/bug?extid=ca172a0ac477ac90f045
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=144150e2e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11aaa9fce00000

Reported-by: syzbot+ca172a0ac477ac90f045@...kaller.appspotmail.com
Fixes: 9d71dd0c7009 ("can: add support of SAE J1939 protocol")

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