From: Eric Dumazet <edumazet@google.com>
Date: Wed, 3 Jul 2013 21:04:14 +0000 (-0700)
Subject: netem: fix possible NULL deref in netem_dequeue()
X-Git-Tag: firefly_0821_release~176^2~5751^2~20
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=36b7bfe09b6deb71bf387852465245783c9a6208;p=firefly-linux-kernel-4.4.55.git

netem: fix possible NULL deref in netem_dequeue()

commit aec0a40a6f7884 ("netem: use rb tree to implement the time queue")
added a regression if a child qdisc is attached to netem, as we perform
a NULL dereference.

Fix this by adding a temporary variable to cache
netem_skb_cb(skb)->time_to_send.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sched/sch_netem.c b/net/sched/sch_netem.c
index ed0082cf8eff..82f6016d89ab 100644
--- a/net/sched/sch_netem.c
+++ b/net/sched/sch_netem.c
@@ -554,10 +554,13 @@ deliver:
 	}
 	p = rb_first(&q->t_root);
 	if (p) {
+		psched_time_t time_to_send;
+
 		skb = netem_rb_to_skb(p);
 
 		/* if more time remaining? */
-		if (netem_skb_cb(skb)->time_to_send <= psched_get_time()) {
+		time_to_send = netem_skb_cb(skb)->time_to_send;
+		if (time_to_send <= psched_get_time()) {
 			rb_erase(p, &q->t_root);
 
 			sch->q.qlen--;
@@ -593,8 +596,7 @@ deliver:
 			if (skb)
 				goto deliver;
 		}
-		qdisc_watchdog_schedule(&q->watchdog,
-					netem_skb_cb(skb)->time_to_send);
+		qdisc_watchdog_schedule(&q->watchdog, time_to_send);
 	}
 
 	if (q->qdisc) {