[PATCH 3.12 09/83] ipv6: protect for_each_sk_fl_rcu in mem_check with rcu_read_lock_bh

From: Greg Kroah-Hartman
Date: Fri Dec 06 2013 - 16:52:39 EST


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

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

From: Hannes Frederic Sowa <hannes@xxxxxxxxxxxxxxxxxxx>

[ Upstream commit f8c31c8f80dd882f7eb49276989a4078d33d67a7 ]

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: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv6/ip6_flowlabel.c | 2 ++
1 file changed, 2 insertions(+)

--- 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 ||


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