Work around interop issue with WPA type EAPOL-Key 4/4 in WPA2 mode

Some deployed station implementations seem to send msg 4/4 with
incorrect type value in WPA2 mode. Add a workaround to ignore that issue
so that such stations can interoperate with hostapd authenticator. The
validation checks were added in commit
f8e96eb6fd960a017793942cff0eb43b09f444c6.

Signed-hostap: Jouni Malinen <j@w1.fi>

src/ap/wpa_auth.c

@@ -795,7 +795,14 @@ void wpa_receive(struct wpa_authenticator *wpa_auth,
 	}
 
 	if (sm->wpa == WPA_VERSION_WPA2) {
-		if (key->type != EAPOL_KEY_TYPE_RSN) {
+		if (key->type == EAPOL_KEY_TYPE_WPA) {
+			/*
+			 * Some deployed station implementations seem to send
+			 * msg 4/4 with incorrect type value in WPA2 mode.
+			 */
+			wpa_printf(MSG_DEBUG, "Workaround: Allow EAPOL-Key "
+				   "with unexpected WPA type in RSN mode");
+		} else if (key->type != EAPOL_KEY_TYPE_RSN) {
 			wpa_printf(MSG_DEBUG, "Ignore EAPOL-Key with "
 				   "unexpected type %d in RSN mode",
 				   key->type);