netdev - Re: net/dccp: use-after-free in dccp_feat_activate

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Date:   Fri, 3 Mar 2017 07:22:33 -0800
From:   Eric Dumazet <edumazet@...gle.com>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     Eric Dumazet <eric.dumazet@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Gerrit Renker <gerrit@....abdn.ac.uk>,
        "David S. Miller" <davem@...emloft.net>, dccp@...r.kernel.org,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: net/dccp: use-after-free in dccp_feat_activate_values

On Fri, Mar 3, 2017 at 7:12 AM, Dmitry Vyukov <dvyukov@...gle.com> wrote:
> The first bot that picked this up started spewing:
>
> BUG: spinlock recursion on CPU#1, syz-executor2/9452

Yes. The bug is not about locking the listener, but protecting fields
of struct dccp_request_sock

I will provide a patch, once I reach the office and after the breakfast ;)