From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Date: Fri, 8 Nov 2013 18:26:21 +0000 (+0100)
Subject: ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh
X-Git-Url: http://git.mmlx.us/?a=commitdiff_plain;h=e688cd4d32cfbf0b5198ba95da428038e907e633;p=linux-edison.git

ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh

[ Upstream commit f8c31c8f80dd882f7eb49276989a4078d33d67a7 ]

Fixes a suspicious rcu derference warning.

Cc: Florent Fourcot <florent.fourcot@enst-bretagne.fr>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 46e88433ec7..f0ccdb78710 100644
--- a/net/ipv6/ip6_flowlabel.c
+++ b/net/ipv6/ip6_flowlabel.c
@@ -453,8 +453,10 @@ static int mem_check(struct sock *sk)
 	if (room > FL_MAX_SIZE - FL_MAX_PER_SOCK)
 		return 0;
 
+	rcu_read_lock_bh();
 	for_each_sk_fl_rcu(np, sfl)
 		count++;
+	rcu_read_unlock_bh();
 
 	if (room <= 0 ||
 	    ((count >= FL_MAX_PER_SOCK ||