linux-kernel - Re: net: suspicious RCU usage in nf

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Message-ID: <CAM_iQpVvBPhP4q=Egsaoqf8ym-73jLZow8xDMbOq9RhYmL5XAQ@mail.gmail.com>
Date:   Fri, 27 Jan 2017 17:00:25 -0800
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Dmitry Vyukov <dvyukov@...gle.com>,
        David Miller <davem@...emloft.net>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        Eric Dumazet <edumazet@...gle.com>,
        James Morris <jmorris@...ei.org>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Patrick McHardy <kaber@...sh.net>,
        netdev <netdev@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        netfilter-devel@...r.kernel.org,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net: suspicious RCU usage in nf_hook

On Fri, Jan 27, 2017 at 3:35 PM, Eric Dumazet <eric.dumazet@...il.com> wrote:
> Oh well, I forgot to submit the official patch I think, Jan 9th.
>
> https://groups.google.com/forum/#!topic/syzkaller/BhyN5OFd7sQ
>

Hmm, but why only fragments need skb_orphan()? It seems like
any kfree_skb() inside a nf hook needs to have a preceding
skb_orphan().

Also, I am not convinced it is similar to commit 8282f27449bf15548
which is on RX path.