linux-kernel - [PATCH 3.11 27/66] netem: free skbs in tree on reset

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Message-Id: <20131101220642.285992309@linuxfoundation.org>
Date:	Fri,  1 Nov 2013 15:07:03 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Stephen Hemminger <stephen@...workplumber.org>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.11 27/66] netem: free skbs in tree on reset

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

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

From: stephen hemminger <stephen@...workplumber.org>

[ Upstream commit ff704050f2fc0f3382b5a70bba56a51a3feca79d ]

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

Reported by: Сергеев Сергей <adron@...ic.net>
Signed-off-by: Stephen Hemminger <stephen@...workplumber.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sched/sch_netem.c |   16 ++++++++++++++++
 1 file changed, 16 insertions(+)

--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -358,6 +358,21 @@ static psched_time_t packet_len_2_sched_
 	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);
@@ -613,6 +628,7 @@ static void netem_reset(struct Qdisc *sc
 	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);


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