From: Jarek Poplawski <jarkao2@gmail.com>
Date: Wed, 13 Aug 2008 22:16:43 +0000 (-0700)
Subject: pkt_sched: Fix oops in htb_delete.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=26b284de54a5ca3dfbe2fd9a51ac1923e80085a2;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

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@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index be35422711a3..6febd245e62b 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);