From: David S. Miller <davem@davemloft.net>
Date: Thu, 11 Nov 2010 05:35:37 +0000 (-0800)
Subject: tcp: Increase TCP_MAXSEG socket option minimum.
X-Git-Tag: v2.6.37-rc2~20^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7a1abd08d52fdeddb3e9a5a33f2f15cc6a5674d2;p=pandora-kernel.git

tcp: Increase TCP_MAXSEG socket option minimum.

As noted by Steve Chen, since commit
f5fff5dc8a7a3f395b0525c02ba92c95d42b7390 ("tcp: advertise MSS
requested by user") we can end up with a situation where
tcp_select_initial_window() does a divide by a zero (or
even negative) mss value.

The problem is that sometimes we effectively subtract
TCPOLEN_TSTAMP_ALIGNED and/or TCPOLEN_MD5SIG_ALIGNED from the mss.

Fix this by increasing the minimum from 8 to 64.

Reported-by: Steve Chen <schen@mvista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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