linux-kernel - Re: KASAN: use-after-free Read in j1939_xtp_rx_abort

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Message-ID: <000000000000a0ef18059c082789@google.com>
Date:   Mon, 13 Jan 2020 08:42:02 -0800
From:   syzbot <syzbot+db4869ba599c0de9b13e@...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_xtp_rx_abort_one

syzbot suspects this bug was fixed by commit:

commit ddeeb7d4822ed06d79fc15e822b70dce3fa77e39
Author: Oleksij Rempel <o.rempel@...gutronix.de>
Date:   Sat Nov 9 15:11:18 2019 +0000

     can: j1939: j1939_can_recv(): add priv refcounting

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=15a7ec76e00000
start commit:   de620fb9 Merge branch 'for-5.4-fixes' of git://git.kernel...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=f9ff8f11e66c1fb1
dashboard link: https://syzkaller.appspot.com/bug?extid=db4869ba599c0de9b13e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=113e0d72e00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=136aa6e8e00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: can: j1939: j1939_can_recv(): add priv refcounting

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