linux-kernel - [PATCH 3.18 10/19] net: fix suspicious rcu_dereference_check in net/sched/sch_fq

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Date:	Sun, 14 Dec 2014 12:21:21 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Valdis Kletnieks <valdis.kletnieks@...edu>,
	Eric Dumazet <edumazet@...gle.com>,
	John Fastabend <john.r.fastabend@...el.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.18 10/19] net: fix suspicious rcu_dereference_check in net/sched/sch_fq_codel.c

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

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

From: "Valdis.Kletnieks@...edu" <Valdis.Kletnieks@...edu>

[ Upstream commit 69204cf7eb9c5a72067ce6922d4699378251d053 ]

commit 46e5da40ae (net: qdisc: use rcu prefix and silence
 sparse warnings) triggers a spurious warning:

net/sched/sch_fq_codel.c:97 suspicious rcu_dereference_check() usage!

The code should be using the _bh variant of rcu_dereference.

Signed-off-by: Valdis Kletnieks <valdis.kletnieks@...edu>
Acked-by: Eric Dumazet <edumazet@...gle.com>
Acked-by: John Fastabend <john.r.fastabend@...el.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/sch_fq_codel.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/sched/sch_fq_codel.c
+++ b/net/sched/sch_fq_codel.c
@@ -94,7 +94,7 @@ static unsigned int fq_codel_classify(st
 	    TC_H_MIN(skb->priority) <= q->flows_cnt)
 		return TC_H_MIN(skb->priority);
 
-	filter = rcu_dereference(q->filter_list);
+	filter = rcu_dereference_bh(q->filter_list);
 	if (!filter)
 		return fq_codel_hash(q, skb) + 1;
 


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