From: Eric Dumazet <edumazet@google.com>
Date: Mon, 22 Sep 2014 20:19:44 +0000 (-0700)
Subject: tcp: avoid possible arithmetic overflows
X-Git-Tag: fixes-against-v3.18-rc2~81^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=fcdd1cf4dd63aecf86c987d7f4ec7187be5c2fbc;p=pandora-kernel.git

tcp: avoid possible arithmetic overflows

icsk_rto is a 32bit field, and icsk_backoff can reach 15 by default,
or more if some sysctl (eg tcp_retries2) are changed.

Better use 64bit to perform icsk_rto << icsk_backoff operations

As Joe Perches suggested, add a helper for this.

Yuchung spotted the tcp_v4_err() case.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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