output: #fixed code
                                  public AppiumServiceBuilder getAppiumServiceBuilder(String methodName) throws Exception {
          String webKitPort = iosDevice.startIOSWebKit(device_udid);
          return appiumMan.appiumServerForIOS(device_udid, methodName, webKitPort);
      }
input: #vulnerable code 
                                  public AppiumServiceBuilder getAppiumServiceBuilder(String methodName) throws Exception {
          if (iosDevice.checkiOSDevice(device_udid)) {
              String webKitPort = iosDevice.startIOSWebKit(device_udid);
              return appiumMan.appiumServerForIOS(device_udid, methodName, webKitPort);
          } else if (!iosDevice.checkiOSDevice(device_udid)) {
              return appiumMan.appiumServerForAndroid(device_udid, methodName);
          }
          return null;
      } 
                              #location 6 
                              #vulnerability type THREAD_SAFETY_VIOLATION