D34078.diff
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	diff --git a/sys/netpfil/ipfw/dn_sched_wf2q.c b/sys/netpfil/ipfw/dn_sched_wf2q.c
	--- a/sys/netpfil/ipfw/dn_sched_wf2q.c
	+++ b/sys/netpfil/ipfw/dn_sched_wf2q.c
	@@ -243,6 +243,8 @@
	q = HEAP_TOP(sch)->object;
	alg_fq = (struct wf2qp_queue *)q;
	m = dn_dequeue(q);
	+ if (m == NULL)
	+ return NULL;
	heap_extract(sch, NULL); /* Remove queue from heap. */
	si->V += (uint64_t)(m->m_pkthdr.len) * si->inv_wsum;
	alg_fq->S = alg_fq->F; /* Update start time. */