[PATCH 3.11 008/208] ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh

[Luis Henriques]

3.11.10.2 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>

commit f8c31c8f80dd882f7eb49276989a4078d33d67a7 upstream.

Fixes a suspicious rcu derference warning.

Cc: Florent Fourcot <florent.fourcot@xxxxxxxxxxxxxxxx>
Signed-off-by: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
 net/ipv6/ip6_flowlabel.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/net/ipv6/ip6_flowlabel.c b/net/ipv6/ip6_flowlabel.c
index 46e8843..f0ccdb7 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 ||
-- 
1.8.3.2

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