--- zzzz-none-000/linux-2.6.32.61/net/sched/sch_sfq.c	2013-06-10 09:43:48.000000000 +0000
+++ ar9-7330-650/linux-2.6.32.61/net/sched/sch_sfq.c	2012-03-23 13:40:54.000000000 +0000
@@ -358,6 +358,8 @@
 
 	/* Grab packet */
 	skb = __skb_dequeue(&q->qs[a]);
+    if (!skb)
+       return NULL;
 	sfq_dec(q, a);
 	sch->q.qlen--;
 	sch->qstats.backlog -= qdisc_pkt_len(skb);