--- src/sys/netpfil/ipfw/ip_dummynet.c.orig	2014-05-02 01:36:59.000000000 -0400
+++ src/sys/netpfil/ipfw/ip_dummynet.c	2014-05-02 01:35:58.000000000 -0400
@@ -1210,15 +1210,18 @@
  * configure a link (and its FIFO instance)
  */
 static int
-config_link(struct dn_link *p, struct dn_id *arg)
+config_link(struct dn_link *op, struct dn_id *arg)
 {
+	struct dn_link np;
 	int i;
 
-	if (p->oid.len != sizeof(*p)) {
-		D("invalid pipe len %d", p->oid.len);
+	bcopy(&(op->oid.len), &(np.oid.len), sizeof(np.oid.len));
+	if (np.oid.len != sizeof(np)) {
+		D("invalid pipe len %d", np.oid.len);
 		return EINVAL;
 	}
-	i = p->link_nr;
+	bcopy(op, &np, sizeof(np));
+	i = np.link_nr;
 	if (i <= 0 || i >= DN_MAX_ID)
 		return EINVAL;
 	/*
@@ -1228,9 +1231,9 @@
 	 * qsize = slots/bytes
 	 * burst ???
 	 */
-	p->delay = (p->delay * hz) / 1000;
+	np.delay = (np.delay * hz) / 1000;
 	/* Scale burst size: bytes -> bits * hz */
-	p->burst *= 8 * hz;
+	np.burst *= 8 * hz;
 
 	DN_BH_WLOCK();
 	/* do it twice, base link and FIFO link */
@@ -1247,15 +1250,15 @@
 		s->profile = NULL;
 	    }
 	    /* copy all parameters */
-	    s->link.oid = p->oid;
+	    s->link.oid = np.oid;
 	    s->link.link_nr = i;
-	    s->link.delay = p->delay;
-	    if (s->link.bandwidth != p->bandwidth) {
+	    s->link.delay = np.delay;
+	    if (s->link.bandwidth != np.bandwidth) {
 		/* XXX bandwidth changes, need to update red params */
-	    s->link.bandwidth = p->bandwidth;
+	    s->link.bandwidth = np.bandwidth;
 		update_red(s);
 	    }
-	    s->link.burst = p->burst;
+	    s->link.burst = np.burst;
 	    schk_reset_credit(s);
 	}
 	dn_cfg.id++;