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netem: free skb's in tree on reset

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Netem can leak memory because packets get stored in red-black
tree and it is not cleared on reset.

Reported by: Сергеев Сергей <adron@yapic.net>
Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
stephen hemminger 2013-10-06 15:16:49 -07:00 committed by David S. Miller
parent 638a52b801
commit ff704050f2
1 changed files with 16 additions and 0 deletions
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16
net/sched/sch_netem.c
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@ -358,6 +358,21 @@ static psched_time_t packet_len_2_sched_time(unsigned int len, struct netem_sche
return PSCHED_NS2TICKS(ticks);
}
static void tfifo_reset(struct Qdisc *sch)
{
struct netem_sched_data *q = qdisc_priv(sch);
struct rb_node *p;
while ((p = rb_first(&q->t_root))) {
struct sk_buff *skb = netem_rb_to_skb(p);
rb_erase(p, &q->t_root);
skb->next = NULL;
skb->prev = NULL;
kfree_skb(skb);
}
}
static void tfifo_enqueue(struct sk_buff *nskb, struct Qdisc *sch)
{
struct netem_sched_data *q = qdisc_priv(sch);
@ -610,6 +625,7 @@ static void netem_reset(struct Qdisc *sch)
struct netem_sched_data *q = qdisc_priv(sch);
qdisc_reset_queue(sch);
tfifo_reset(sch);
if (q->qdisc)
qdisc_reset(q->qdisc);
qdisc_watchdog_cancel(&q->watchdog);