netdev - Re: net/packet: use-after-free in packet_rcv

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Message-ID: <20170213014239.GA21934@oracle.com>
Date:   Sun, 12 Feb 2017 20:42:39 -0500
From:   Sowmini Varadhan <sowmini.varadhan@...cle.com>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     Cong Wang <xiyou.wangcong@...il.com>,
        Anoob Soman <anoob.soman@...rix.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        David Miller <davem@...emloft.net>,
        Willem de Bruijn <willemb@...gle.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Daniel Borkmann <daniel@...earbox.net>, jarno@....org,
        philip.pettersson@...il.com, weongyo.linux@...il.com,
        netdev <netdev@...r.kernel.org>,
        syzkaller <syzkaller@...glegroups.com>
Subject: Re: net/packet: use-after-free in packet_rcv_fanout

On (02/10/17 10:02), Eric Dumazet wrote:
> At least, Anoob patch is making a step into the right direction ;)
> https://patchwork.ozlabs.org/patch/726532/

I've not been able to reproduce Dmitry's panic (though I did not try
very hard either) but there's a call to fanout_release from packet_release
before the synchronize_net() - I wonder if this could end up kfree'ing f
when there are threads in the middle of dev_queue_xmit_nit().

--Sowmini