linux-kernel - Re: KASAN: use-after-free Read in j1939_session_get_by

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Message-ID: <CACT4Y+Y+zudxSaNc4-b02QWu9hPXHrReCKsOLBpscMub5KN7+A@mail.gmail.com>
Date:   Tue, 5 Nov 2019 09:39:26 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     Jose Abreu <Jose.Abreu@...opsys.com>,
        syzbot <syzbot+d9536adc269404a984f8@...kaller.appspotmail.com>,
        "arvid.brodin@...en.se" <arvid.brodin@...en.se>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "ilias.apalodimas@...aro.org" <ilias.apalodimas@...aro.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "linux-can@...r.kernel.org" <linux-can@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux@...pel-privat.de" <linux@...pel-privat.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "robin@...tonic.nl" <robin@...tonic.nl>,
        "socketcan@...tkopp.net" <socketcan@...tkopp.net>,
        "syzkaller-bugs@...glegroups.com" <syzkaller-bugs@...glegroups.com>
Subject: Re: KASAN: use-after-free Read in j1939_session_get_by_addr

On Tue, Nov 5, 2019 at 9:35 AM Marc Kleine-Budde <mkl@...gutronix.de> wrote:
>
> On 11/5/19 9:21 AM, Jose Abreu wrote:
> > From: syzbot <syzbot+d9536adc269404a984f8@...kaller.appspotmail.com>
> > Date: Nov/05/2019, 08:05:01 (UTC+00:00)
> >
> >> syzbot has bisected this bug to:
> >>
> >> commit 2af6106ae949651d529c8c3f0734c3a7babd0d4b
> >> Author: Jose Abreu <Jose.Abreu@...opsys.com>
> >> Date:   Tue Jul 9 08:03:00 2019 +0000
> >>
> >>      net: stmmac: Introducing support for Page Pool
> >
> > From the config provided, stmmac driver is not even enabled. Can you
> > please confirm the bisection process ?
>
> Looks like a false positive, as j1939 (net/can/j1939/) hit mainline with
> v5.4-rc1~131^2~78^2.
>
> While the bisected commit is v5.3-rc1~140^2~13^2.


Yes, the commit is most likely irrelevant. As you can see in the
bisection log the process was diverged by "WARNING: ODEBUG bug in
netdev_freemem". I think it's not the first and not the second time I
see that crash breaks bisection:
https://syzkaller.appspot.com/bug?id=96a64fde216dca408a5c25db4e57838c51e435aa