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net_sched: Bug in netem reordering

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Not now, but it looks you are correct. q->qdisc is NULL until another
additional qdisc is attached (beside tfifo). See 50612537e9.
The following patch should work.

From: Hagen Paul Pfeifer <[email protected]>

netem: catch NULL pointer by updating the real qdisc statistic

Reported-by: Vijay Subramanian <[email protected]>
Signed-off-by: Hagen Paul Pfeifer <[email protected]>
Acked-by: Eric Dumazet <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
This commit is contained in:
Hagen Paul Pfeifer 2012-01-04 17:35:26 +00:00 • committed by David S. Miller
commit eb10192447
1 changed files with 2 additions and 2 deletions
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4
net/sched/sch_netem.c
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@ -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;
}