linux-kernel - [ 23/72] net_sched: Bug in netem reordering

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Message-Id: <20120228010431.451239234@linuxfoundation.org>
Date:	Mon, 27 Feb 2012 17:04:52 -0800
From:	Greg KH <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk,
	Vijay Subramanian <subramanian.vijay@...il.com>,
	Hagen Paul Pfeifer <hagen@...u.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [ 23/72] net_sched: Bug in netem reordering

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

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


From: Hagen Paul Pfeifer <hagen@...u.net>

[ Upstream commit eb10192447370f19a215a8c2749332afa1199d46 ]

Not now, but it looks you are correct. q->qdisc is NULL until another
additional qdisc is attached (beside tfifo). See 50612537e9ab2969312.
The following patch should work.

From: Hagen Paul Pfeifer <hagen@...u.net>

netem: catch NULL pointer by updating the real qdisc statistic

Reported-by: Vijay Subramanian <subramanian.vijay@...il.com>
Signed-off-by: Hagen Paul Pfeifer <hagen@...u.net>
Acked-by: Eric Dumazet <eric.dumazet@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/sch_netem.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -383,8 +383,8 @@ static int netem_enqueue(struct sk_buff
 		q->counter = 0;
 
 		__skb_queue_head(&q->qdisc->q, skb);
-		q->qdisc->qstats.backlog += qdisc_pkt_len(skb);
-		q->qdisc->qstats.requeues++;
+		sch->qstats.backlog += qdisc_pkt_len(skb);
+		sch->qstats.requeues++;
 		ret = NET_XMIT_SUCCESS;
 	}
 


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