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authorAlexey Kuznetsov <kuznet@ms2.inr.ac.ru>2007-09-19 10:42:03 -0700
committerDavid S. Miller <davem@sunset.davemloft.net>2007-09-20 12:14:08 -0700
commit5588b40d7c2bff75ee573ed42d1738c73ce24492 (patch)
treeab075cd6d417054139ce9b0d90c4fff5aa59ab0a /net/sched/sch_sfq.c
parent1a03b81db96aeaac0276224f25c0701a1ba37318 (diff)
downloadblackbird-op-linux-5588b40d7c2bff75ee573ed42d1738c73ce24492.tar.gz
blackbird-op-linux-5588b40d7c2bff75ee573ed42d1738c73ce24492.zip
[PKT_SCHED]: Fix 'SFQ qdisc crashes with limit of 2 packets'
Acked-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_sfq.c')
-rw-r--r--net/sched/sch_sfq.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/net/sched/sch_sfq.c b/net/sched/sch_sfq.c
index 957957309859..3a23e30bc79e 100644
--- a/net/sched/sch_sfq.c
+++ b/net/sched/sch_sfq.c
@@ -270,7 +270,7 @@ sfq_enqueue(struct sk_buff *skb, struct Qdisc* sch)
q->tail = x;
}
}
- if (++sch->q.qlen < q->limit-1) {
+ if (++sch->q.qlen <= q->limit) {
sch->bstats.bytes += skb->len;
sch->bstats.packets++;
return 0;
@@ -306,7 +306,7 @@ sfq_requeue(struct sk_buff *skb, struct Qdisc* sch)
q->tail = x;
}
}
- if (++sch->q.qlen < q->limit - 1) {
+ if (++sch->q.qlen <= q->limit) {
sch->qstats.requeues++;
return 0;
}
@@ -391,10 +391,10 @@ static int sfq_change(struct Qdisc *sch, struct rtattr *opt)
q->quantum = ctl->quantum ? : psched_mtu(sch->dev);
q->perturb_period = ctl->perturb_period*HZ;
if (ctl->limit)
- q->limit = min_t(u32, ctl->limit, SFQ_DEPTH);
+ q->limit = min_t(u32, ctl->limit, SFQ_DEPTH - 2);
qlen = sch->q.qlen;
- while (sch->q.qlen >= q->limit-1)
+ while (sch->q.qlen > q->limit)
sfq_drop(sch);
qdisc_tree_decrease_qlen(sch, qlen - sch->q.qlen);
@@ -423,7 +423,7 @@ static int sfq_init(struct Qdisc *sch, struct rtattr *opt)
q->dep[i+SFQ_DEPTH].next = i+SFQ_DEPTH;
q->dep[i+SFQ_DEPTH].prev = i+SFQ_DEPTH;
}
- q->limit = SFQ_DEPTH;
+ q->limit = SFQ_DEPTH - 2;
q->max_depth = 0;
q->tail = SFQ_DEPTH;
if (opt == NULL) {
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