netdev - Re: [PATCH net] tcp: fix overflow in __tcp_retransmit

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Message-Id: <20160917.100024.377016575232308074.davem@davemloft.net>
Date:   Sat, 17 Sep 2016 10:00:24 -0400 (EDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net] tcp: fix overflow in __tcp_retransmit_skb()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 15 Sep 2016 08:12:33 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> If a TCP socket gets a large write queue, an overflow can happen
> in a test in __tcp_retransmit_skb() preventing all retransmits.
> 
> The flow then stalls and resets after timeouts.
> 
> Tested:
> 
> sysctl -w net.core.wmem_max=1000000000
> netperf -H dest -- -s 1000000000
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.