netdev - Re: [Patch net] tcp: reset sk_rx_dst in tcp

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Message-ID: <CAAvyFNitoxhPpivWaY+qgW+ssVxvt-3O+4eBfYCN81a0Dn7JZg@mail.gmail.com>
Date:   Wed, 5 Jul 2017 16:54:01 +1000
From:   Jamie Bainbridge <jamie.bainbridge@...il.com>
To:     Cong Wang <xiyou.wangcong@...il.com>
Cc:     netdev@...r.kernel.org, avagin@...il.com, kaiwen.xu@...u.com
Subject: Re: [Patch net] tcp: reset sk_rx_dst in tcp_disconnect()

On 25 June 2017 at 16:50, Cong Wang <xiyou.wangcong@...il.com> wrote:
> We have to reset the sk->sk_rx_dst when we disconnect a TCP
> connection, because otherwise when we re-connect it this
> dst reference is simply overridden in tcp_finish_connect().
>
> This fixes a dst leak which leads to a loopback dev refcnt
> leak. It is a long-standing bug, Kevin reported a very similar
> (if not same) bug before. Thanks to Andrei for providing such
> a reliable reproducer which greatly narrows down the problem.
>
> Fixes: 41063e9dd119 ("ipv4: Early TCP socket demux.")
> Reported-by: Andrei Vagin <avagin@...il.com>
> Reported-by: Kevin Xu <kaiwen.xu@...u.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Are you able to supply the reproducer for this?

I did search for a previous thread about it but could not find.

Jamie