diff --git a/net/sched/sch_ets.c b/net/sched/sch_ets.c
index 05817c55692f0a2db4d027b6d6510ca6dc8edd18..0afd9187f836aca5880d026ebff3b6bdaac37199 100644
--- a/net/sched/sch_ets.c
+++ b/net/sched/sch_ets.c
@@ -91,6 +91,8 @@ ets_class_from_arg(struct Qdisc *sch, unsigned long arg)
 {
 	struct ets_sched *q = qdisc_priv(sch);
 
+	if (arg == 0 || arg > q->nbands)
+		return NULL;
 	return &q->classes[arg - 1];
 }