From: Eric Dumazet <edumazet@google.com>
Date: Thu, 4 Sep 2014 05:21:56 +0000 (-0700)
Subject: ipv4: fix a race in update_or_create_fnhe()
X-Git-Tag: fixes-against-v3.18-rc2~81^2~156
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=caa415270c732505240bb60171c44a7838c555e8;p=pandora-kernel.git

ipv4: fix a race in update_or_create_fnhe()

nh_exceptions is effectively used under rcu, but lacks proper
barriers. Between kzalloc() and setting of nh->nh_exceptions(),
we need a proper memory barrier.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Fixes: 4895c771c7f00 ("ipv4: Add FIB nexthop exceptions.")
Signed-off-by: David S. Miller <davem@davemloft.net>
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