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

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Date:   Mon, 28 Oct 2019 14:18:06 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
        syzbot <syzbot+e5b57b8780297657b25b@...kaller.appspotmail.com>
Cc:     davem@...emloft.net, leon@...nel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, linux-sctp@...r.kernel.org,
        netdev@...r.kernel.org, nhorman@...driver.com, roid@...lanox.com,
        saeedm@...lanox.com, syzkaller-bugs@...glegroups.com,
        vladbu@...lanox.com, vyasevich@...il.com
Subject: Re: KASAN: use-after-free Read in sctp_sock_dump



On 10/28/19 8:36 AM, Marcelo Ricardo Leitner wrote:
> On Mon, Oct 28, 2019 at 08:32:08AM -0700, syzbot wrote:
>> Hello,
>>
>> syzbot found the following crash on:
>>
>> HEAD commit:    d6d5df1d Linux 5.4-rc5
>> git tree:       upstream
>> console output: https://syzkaller.appspot.com/x/log.txt?x=17ef5a70e00000
>> kernel config:  https://syzkaller.appspot.com/x/.config?x=2bcb64e504d04eff
>> dashboard link: https://syzkaller.appspot.com/bug?extid=e5b57b8780297657b25b
>> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
>> userspace arch: i386
>> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16cd8800e00000
>>
>> The bug was bisected to:
>>
>> commit 61086f391044fd587af9d70a9b8f6f800dd474ba
>> Author: Vlad Buslov <vladbu@...lanox.com>
>> Date:   Fri Aug 2 19:21:56 2019 +0000
>>
>>     net/mlx5e: Protect encap hash table with mutex
>>
>> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=135960af600000
> 
> This is weird. This mlx5e commit has nothing to do with SCTP diag
> dump.

syzbot bisections results might be wrong, it happens quite often.

But the SCTP bug is probably real.