netdev - Re: KASAN: use-after-free Read in sctp_packet

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Message-ID: <CACT4Y+Y_kWEqfqSEiq_yOk7_nm5MuejNbORcfQgspzKHC3aTng@mail.gmail.com>
Date:   Sat, 6 Jan 2018 18:09:45 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
Cc:     syzbot <syzbot+5adcca18fca253b4cb15@...kaller.appspotmail.com>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>, linux-sctp@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        Neil Horman <nhorman@...driver.com>,
        syzkaller-bugs@...glegroups.com,
        Vladislav Yasevich <vyasevich@...il.com>
Subject: Re: KASAN: use-after-free Read in sctp_packet_transmit

On Sat, Jan 6, 2018 at 6:02 PM, Marcelo Ricardo Leitner
<marcelo.leitner@...il.com> wrote:
> On Fri, Jan 05, 2018 at 02:07:01PM -0800, syzbot wrote:
>> Hello,
>>
>> syzkaller hit the following crash on
>> 8a4816cad00bf14642f0ed6043b32d29a05006ce
>> git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next.git/master
>> compiler: gcc (GCC) 7.1.1 20170620
>> .config is attached
>> Raw console output is attached.
>> Unfortunately, I don't have any reproducer for this bug yet.
>
> How can we tell if there wasn't any list corruption messages before
> the panic?

Hi Marcelo,

syzbot always gives reports on non-tainted kernels. So, no, there was
nothing bad before this.