Index: dev/iwi/if_iwi.c
===================================================================
RCS file: /home/ncvs/src/sys/dev/iwi/if_iwi.c,v
retrieving revision 1.80
diff -u -r1.80 if_iwi.c
--- dev/iwi/if_iwi.c	17 Dec 2011 10:23:17 -0000	1.80
+++ dev/iwi/if_iwi.c	7 Mar 2012 04:32:22 -0000
@@ -1357,8 +1359,8 @@
 	frm += 2;
 
 	wme = NULL;
-	while (frm < efrm) {
-		IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1], return);
+	while (efrm - frm > 1) {
+		IEEE80211_VERIFY_LENGTH(efrm - frm, frm[1] + 2, return);
 		switch (*frm) {
 		case IEEE80211_ELEMID_VENDOR:
 			if (iswmeoui(frm))