mac80211: use element iteration macro in parsing

Instead of open-coding the element walk, use the new macro.
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

net/mac80211/util.c

@@ -895,8 +895,7 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 			       struct ieee802_11_elems *elems,
 			       u64 filter, u32 crc)
 {
-	size_t left = len;
-	const u8 *pos = start;
+	struct element *elem;
 	bool calc_crc = filter != 0;
 	DECLARE_BITMAP(seen_elems, 256);
 	const u8 *ie;
@@ -906,18 +905,11 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 	elems->ie_start = start;
 	elems->total_len = len;
 
-	while (left >= 2) {
-		u8 id, elen;
+	for_each_element(elem, start, len) {
 		bool elem_parse_failed;
-
-		id = *pos++;
-		elen = *pos++;
-		left -= 2;
-
-		if (elen > left) {
-			elems->parse_error = true;
-			break;
-		}
+		u8 id = elem->id;
+		u8 elen = elem->datalen;
+		const u8 *pos = elem->data;
 
 		switch (id) {
 		case WLAN_EID_SSID:
@@ -960,8 +952,6 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 		 */
 			if (test_bit(id, seen_elems)) {
 				elems->parse_error = true;
-				left -= elen;
-				pos += elen;
 				continue;
 			}
 			break;
@@ -1244,12 +1234,9 @@ u32 ieee802_11_parse_elems_crc(const u8 *start, size_t len, bool action,
 			elems->parse_error = true;
 		else
 			__set_bit(id, seen_elems);
-
-		left -= elen;
-		pos += elen;
 	}
 
-	if (left != 0)
+	if (!for_each_element_completed(elem, start, len))
 		elems->parse_error = true;
 
 	return crc;