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

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Message-ID: <969f940b-05ba-3fbf-79ba-95dc1cebc40d@pengutronix.de>
Date:   Tue, 5 Nov 2019 09:33:33 +0100
From:   Marc Kleine-Budde <mkl@...gutronix.de>
To:     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 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.

regards,
Marc

-- 
Pengutronix e.K.                  | Marc Kleine-Budde           |
Industrial Linux Solutions        | Phone: +49-231-2826-924     |
Vertretung West/Dortmund          | Fax:   +49-5121-206917-5555 |
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