From eb10192447370f19a215a8c2749332afa1199d46 Mon Sep 17 00:00:00 2001 From: Hagen Paul Pfeifer <hagen@jauu.net> Date: Wed, 4 Jan 2012 17:35:26 +0000 Subject: [PATCH] net_sched: Bug in netem reordering 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@jauu.net> netem: catch NULL pointer by updating the real qdisc statistic Reported-by: Vijay Subramanian <subramanian.vijay@gmail.com> Signed-off-by: Hagen Paul Pfeifer <hagen@jauu.net> Acked-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net> --- net/sched/sch_netem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c index 06a5cebad342..e7e1d0b57b3d 100644 --- a/net/sched/sch_netem.c +++ b/net/sched/sch_netem.c @@ -458,8 +458,8 @@ static int netem_enqueue(struct sk_buff *skb, struct Qdisc *sch) q->counter = 0; __skb_queue_head(&sch->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; } -- 2.30.2