From: Eric Dumazet <edumazet@google.com>
Date: Thu, 15 Sep 2016 15:12:33 +0000 (-0700)
Subject: tcp: fix overflow in __tcp_retransmit_skb()
X-Git-Tag: v3.2.87~39
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b2c5b70422d6f729f57aa429c0c166159ba8c8d4;p=pandora-kernel.git

tcp: fix overflow in __tcp_retransmit_skb()

[ Upstream commit ffb4d6c8508657824bcef68a36b2a0f9d8c09d10 ]

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@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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