Program: 153720
Project: 153720
Buggy source:
public void nextPacket(PcapPacket packet,String user){
  int i=0;
  while (true) {
    Ip4 ip=new Ip4();
    long t=packet.getCaptureHeader().timestampInMillis();
    Tcp tcp=new Tcp();
    Udp udp=new Udp();
    int s=0;
    int d=0;
    int sp=0;
    int tp=0;
    int okcount=0;
    int flag=0;
    Date arriveTime=new Date(t);
    if (packet.hasHeader(ip,i)) {
      s=ip.sourceToInt();
      d=ip.destinationToInt();
      ++okcount;
    }
    if (packet.hasHeader(tcp,i)) {
      sp=tcp.source();
      tp=tcp.destination();
      flag|=IPacket.PacketFlag_TCP;
      ++okcount;
    }
 else     if (packet.hasHeader(udp,i)) {
      sp=udp.source();
      tp=udp.destination();
      flag|=IPacket.PacketFlag_UDP;
      ++okcount;
    }
    if (packet.hasHeader(Http.ID,i)) {
      flag|=IPacket.PacketFlag_HTTP;
    }
    if (packet.hasHeader(Ethernet.ID,i)) {
      flag|=IPacket.PacketFlag_Ethernet;
    }
    if (okcount != 2) {
      break;
    }
 else {
      Packet p=new Packet();
      p.DIP=s;
      p.SIP=d;
      p.DPort=sp;
      p.SPort=tp;
      p.PackLen=packet.getCaptureHeader().caplen();
      p.RecvTime=arriveTime;
      if (s == GetDeviceIpInt(m_dev) || d == GetDeviceIpInt(m_dev)) {
        p.IsUpdate=(GetDeviceIpInt(m_dev) != s);
        p.PacketFlag=flag;
synchronized (ListenThread.this) {
          List<IPacketListener> listeners=m_network.getPacketListeners();
          ListIterator<IPacketListener> it=listeners.listIterator();
          while (it.hasNext()) {
            it.next().onPacketRecv(p);
          }
        }
      }
    }
    ++i;
  }
}

Fixed version (ground truth):
public void nextPacket(PcapPacket packet,String user){
  int i=0;
  while (true) {
    Ip4 ip=new Ip4();
    long t=packet.getCaptureHeader().timestampInMillis();
    Tcp tcp=new Tcp();
    Udp udp=new Udp();
    int s=0;
    int d=0;
    int sp=0;
    int tp=0;
    int okcount=0;
    int flag=0;
    Date arriveTime=new Date(t);
    if (packet.hasHeader(ip,i)) {
      s=ip.sourceToInt();
      d=ip.destinationToInt();
      ++okcount;
    }
    if (packet.hasHeader(tcp,i)) {
      sp=tcp.source();
      tp=tcp.destination();
      flag|=IPacket.PacketFlag_TCP;
      ++okcount;
    }
 else     if (packet.hasHeader(udp,i)) {
      sp=udp.source();
      tp=udp.destination();
      flag|=IPacket.PacketFlag_UDP;
      ++okcount;
    }
    if (packet.hasHeader(Http.ID,i)) {
      flag|=IPacket.PacketFlag_HTTP;
    }
    if (packet.hasHeader(Ethernet.ID,i)) {
      flag|=IPacket.PacketFlag_Ethernet;
    }
    if (okcount != 2) {
      break;
    }
 else {
      Packet p=new Packet();
      p.DIP=d;
      p.SIP=s;
      p.DPort=sp;
      p.SPort=tp;
      p.PackLen=packet.getCaptureHeader().caplen();
      p.RecvTime=arriveTime;
      if (s == GetDeviceIpInt(m_dev) || d == GetDeviceIpInt(m_dev)) {
        p.IsUpdate=(GetDeviceIpInt(m_dev) == s);
        p.PacketFlag=flag;
synchronized (ListenThread.this) {
          List<IPacketListener> listeners=m_network.getPacketListeners();
          ListIterator<IPacketListener> it=listeners.listIterator();
          while (it.hasNext()) {
            it.next().onPacketRecv(p);
          }
        }
      }
    }
    ++i;
  }
}