#vulnerable code 
                              public void initAndRunWorker() throws IOException {
    myServerSocketChannel = selector.provider().openServerSocketChannel();
    myServerSocketChannel.configureBlocking(false);

    for (int port = PORT_RANGE_START; port < PORT_RANGE_END; port++) {
      try {
        InetSocketAddress tryAddress = new InetSocketAddress(inetAddress, port);
        myServerSocketChannel.socket().bind(tryAddress);
        myServerSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
        this.myBindAddress = tryAddress;
        break;
      } catch (IOException e) {
        //try next port
        logger.debug("Could not bind to port {}, trying next port...", port);
      }
    }
    if (this.myBindAddress == null) {
      throw new IOException("No available port for the BitTorrent client!");
    }
    final String id = Client.BITTORRENT_ID_PREFIX + UUID.randomUUID().toString().split("-")[4];
    byte[] idBytes = id.getBytes(Torrent.BYTE_ENCODING);
    Peer self = new Peer(this.myBindAddress, ByteBuffer.wrap(idBytes));
    peersStorageProvider.getPeersStorage().setSelf(self);
    myWorkerFuture = myExecutorService.submit(this);// TODO: 11/22/17 move runnable part to separate class e.g. ConnectionWorker
    logger.info("BitTorrent client [{}] started and " +
                    "listening at {}:{}...",
            new Object[]{
                    self.getShortHexPeerId(),
                    self.getIp(),
                    self.getPort()
            });
  } 
                            #location 28 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                              public void initAndRunWorker() throws IOException {
    myServerSocketChannel = selector.provider().openServerSocketChannel();
    myServerSocketChannel.configureBlocking(false);

    for (int port = PORT_RANGE_START; port < PORT_RANGE_END; port++) {
      try {
        InetSocketAddress tryAddress = new InetSocketAddress(inetAddress, port);
        myServerSocketChannel.socket().bind(tryAddress);
        myServerSocketChannel.register(selector, SelectionKey.OP_ACCEPT);
        this.myBindAddress = tryAddress;
        break;
      } catch (IOException e) {
        //try next port
        logger.debug("Could not bind to port {}, trying next port...", port);
      }
    }
    if (this.myBindAddress == null) {
      throw new IOException("No available port for the BitTorrent client!");
    }
    myWorkerFuture = myExecutorService.submit(this);// TODO: 11/22/17 move runnable part to separate class e.g. ConnectionWorker
  }