netdev - Re: [PATCH net-next] tcp/dccp: fix ireq->pktopts race

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Message-Id: <20151102.153926.1266009648322963748.davem@davemloft.net>
Date:	Mon, 02 Nov 2015 15:39:26 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] tcp/dccp: fix ireq->pktopts race

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 30 Oct 2015 09:46:12 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> IPv6 request sockets store a pointer to skb containing the SYN packet
> to be able to transfer it to full blown socket when 3WHS is done
> (ireq->pktopts -> np->pktoptions)
> 
> As explained in commit 5e0724d027f0 ("tcp/dccp: fix hashdance race for
> passive sessions"), we must transfer the skb only if we won the
> hashdance race, if multiple cpus receive the 'ack' packet completing
> 3WHS at the same time.
> 
> Fixes: e994b2f0fb92 ("tcp: do not lock listener to process SYN packets")
> Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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