WPS: Fixed hostapd to use allocated buffers for device attributes

Previous version did not handle re-configuration correctly since WPS
context data was pointing to old (now freed) strings.

hostapd/wps_hostapd.c

@@ -388,11 +388,11 @@ int hostapd_init_wps(struct hostapd_data *hapd,
 	os_memcpy(wps->ssid, hapd->conf->ssid.ssid, wps->ssid_len);
 	wps->ap = 1;
 	os_memcpy(wps->dev.mac_addr, hapd->own_addr, ETH_ALEN);
-	wps->dev.device_name = hapd->conf->device_name;
-	wps->dev.manufacturer = hapd->conf->manufacturer;
-	wps->dev.model_name = hapd->conf->model_name;
-	wps->dev.model_number = hapd->conf->model_number;
-	wps->dev.serial_number = hapd->conf->serial_number;
+	wps->dev.device_name = os_strdup(hapd->conf->device_name);
+	wps->dev.manufacturer = os_strdup(hapd->conf->manufacturer);
+	wps->dev.model_name = os_strdup(hapd->conf->model_name);
+	wps->dev.model_number = os_strdup(hapd->conf->model_number);
+	wps->dev.serial_number = os_strdup(hapd->conf->serial_number);
 	if (hapd->conf->config_methods) {
 		char *m = hapd->conf->config_methods;
 		if (os_strstr(m, "label"))
@@ -532,6 +532,7 @@ void hostapd_deinit_wps(struct hostapd_data *hapd)
 		return;
 	wps_registrar_deinit(hapd->wps->registrar);
 	os_free(hapd->wps->network_key);
+	wps_device_data_free(&hapd->wps->dev);
 	os_free(hapd->wps);
 	hapd->wps = NULL;
 	hostapd_wps_clear_ies(hapd);