netdev - [PATCH] pkt_sched: Fix oops in htb

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Message-ID: <20080813201259.GA4350@ami.dom.local>
Date:	Wed, 13 Aug 2008 22:13:00 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	Patrick McHardy <kaber@...sh.net>, netdev@...r.kernel.org
Subject: [PATCH] pkt_sched: Fix oops in htb_delete.

pkt_sched: Fix oops in htb_delete.

Recent changes introduced a bug in htb_delete(): cl->parent->children
counter update misses checking cl->parent for NULL, which is used for
root classes, so deleting them causes an oops.

Signed-off-by: Jarek Poplawski <jarkao2@...il.com>

---

 net/sched/sch_htb.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index be35422..6febd24 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -1279,7 +1279,8 @@ static int htb_delete(struct Qdisc *sch, unsigned long arg)

 	/* delete from hash and active; remainder in destroy_class */
 	qdisc_class_hash_remove(&q->clhash, &cl->common);
-	cl->parent->children--;
+	if (cl->parent)
+		cl->parent->children--;

 	if (cl->prio_activity)
 		htb_deactivate(q, cl);
--
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