netdev - Re: [PATCH net] tcp/dccp: remove obsolete WARN

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Message-Id: <20160317.210715.1891529884014626450.davem@davemloft.net>
Date:	Thu, 17 Mar 2016 21:07:15 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	netdev@...r.kernel.org, blazarus@...gle.com, ncardwell@...gle.com
Subject: Re: [PATCH net] tcp/dccp: remove obsolete WARN_ON() in icmp
 handlers

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 16 Mar 2016 22:52:15 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> Now SYN_RECV request sockets are installed in ehash table, an ICMP
> handler can find a request socket while another cpu handles an incoming
> packet transforming this SYN_RECV request socket into an ESTABLISHED
> socket.
> 
> We need to remove the now obsolete WARN_ON(req->sk), since req->sk
> is set when a new child is created and added into listener accept queue.
> 
> If this race happens, the ICMP will do nothing special.
> 
> Fixes: 079096f103fa ("tcp/dccp: install syn_recv requests into ehash table")
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> Reported-by: Ben Lazarus <blazarus@...gle.com>
> Reported-by: Neal Cardwell <ncardwell@...gle.com>

Applied and queued up for -stable, thanks Eric.