D-Bus: Fix memory leak on P2P GO WPSVendorExtensions

It was possible to add WPS vendor extensions through the D-Bus
WPSVendorExtensions setter, but these extensions were not freed when the
P2P GO was stopped or when replacing previously configured extensions.

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

src/ap/ap_config.c

@@ -496,6 +496,12 @@ void hostapd_config_free_bss(struct hostapd_bss_config *conf)
 	os_free(conf->model_description);
 	os_free(conf->model_url);
 	os_free(conf->upc);
+	{
+		unsigned int i;
+
+		for (i = 0; i < MAX_WPS_VENDOR_EXTENSIONS; i++)
+			wpabuf_free(conf->wps_vendor_ext[i]);
+	}
 	wpabuf_free(conf->wps_nfc_dh_pubkey);
 	wpabuf_free(conf->wps_nfc_dh_privkey);
 	wpabuf_free(conf->wps_nfc_dev_pw);

wpa_supplicant/dbus/dbus_new_handlers_p2p.c

@@ -2223,6 +2223,7 @@ dbus_bool_t wpas_dbus_setter_p2p_group_vendor_ext(DBusMessageIter *iter,
 				goto error;
 
 			for (i = 0; i < MAX_WPS_VENDOR_EXTENSIONS; i++) {
+				wpabuf_free(hapd->conf->wps_vendor_ext[i]);
 				if (i < entry.array_len) {
 					hapd->conf->wps_vendor_ext[i] =
 						entry.binarray_value[i];