Program: 32376
Project: 32376
Buggy source:
@Override protected String doInBackground(String... params){
  int length=params.length;
  String urlString=params[0];
  String request_type=params[1];
  String data;
  if (length > 2) {
    data=params[2];
  }
 else {
    data=null;
  }
  String contentType;
  if (length > 3) {
    contentType=params[3];
  }
 else {
    contentType="String_Node_Str";
  }
  String acceptType;
  if (length > 4) {
    acceptType=params[4];
  }
 else {
    acceptType="String_Node_Str";
  }
  if (urlString == null || request_type == null) {
    Log.e(TAG,"String_Node_Str");
    if (cb != null) {
      cb.httpFailure(-1);
      cb=null;
    }
    return "String_Node_Str";
  }
  HttpURLConnection urlConnection=null;
  BufferedReader reader=null;
  try {
    URL url=new URL(urlString);
    urlConnection=(HttpURLConnection)url.openConnection();
    urlConnection.setDoOutput(true);
    urlConnection.setRequestMethod(request_type);
    urlConnection.setRequestProperty("String_Node_Str",contentType);
    urlConnection.setRequestProperty("String_Node_Str",acceptType);
    if (data != null) {
      Writer writer=new BufferedWriter(new OutputStreamWriter(urlConnection.getOutputStream(),"String_Node_Str"));
      writer.write(data);
      writer.close();
    }
    InputStream inputStream=urlConnection.getInputStream();
    int responseCode=urlConnection.getResponseCode();
    if (responseCode == 200) {
      StringBuffer buffer=new StringBuffer();
      if (inputStream == null) {
        if (cb != null) {
          cb.httpCallComplete(null);
          cb=null;
        }
        return null;
      }
      reader=new BufferedReader(new InputStreamReader(inputStream));
      String inputLine;
      while ((inputLine=reader.readLine()) != null)       buffer.append(inputLine + "String_Node_Str");
      if (buffer.length() == 0) {
        if (cb != null) {
          cb.httpCallComplete(null);
          cb=null;
        }
        return null;
      }
      String response=null;
      response=buffer.toString();
      if (cb != null) {
        cb.httpCallComplete(response);
        cb=null;
      }
      return response;
    }
 else {
      if (cb != null) {
        cb.httpFailure(responseCode);
        cb=null;
      }
      Log.e(TAG,"String_Node_Str" + responseCode);
      return null;
    }
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
 finally {
    if (urlConnection != null) {
      urlConnection.disconnect();
    }
    if (reader != null) {
      try {
        reader.close();
      }
 catch (      final IOException e) {
        Log.e(TAG,"String_Node_Str",e);
      }
    }
    if (cb != null) {
      cb.httpFailure(-1);
    }
  }
  return null;
}

Fixed version (ground truth):
@Override protected String doInBackground(String... params){
  int length=params.length;
  String urlString=params[0];
  String request_type=params[1];
  String data;
  if (length > 2) {
    data=params[2];
  }
 else {
    data=null;
  }
  String contentType;
  if (length > 3) {
    contentType=params[3];
  }
 else {
    contentType="String_Node_Str";
  }
  String acceptType;
  if (length > 4) {
    acceptType=params[4];
  }
 else {
    acceptType="String_Node_Str";
  }
  if (urlString == null || request_type == null) {
    Log.e(TAG,"String_Node_Str");
    if (cb != null) {
      cb.httpFailure(-1);
      cb=null;
    }
    return "String_Node_Str";
  }
  HttpURLConnection urlConnection=null;
  BufferedReader reader=null;
  try {
    URL url=new URL(urlString);
    urlConnection=(HttpURLConnection)url.openConnection();
    urlConnection.setDoOutput(true);
    urlConnection.setRequestMethod(request_type);
    urlConnection.setRequestProperty("String_Node_Str",contentType);
    urlConnection.setRequestProperty("String_Node_Str",acceptType);
    if (data != null) {
      Writer writer=new BufferedWriter(new OutputStreamWriter(urlConnection.getOutputStream(),"String_Node_Str"));
      writer.write(data);
      writer.close();
    }
    InputStream inputStream=urlConnection.getInputStream();
    int responseCode=urlConnection.getResponseCode();
    if (responseCode == 200) {
      StringBuffer buffer=new StringBuffer();
      if (inputStream == null) {
        if (cb != null) {
          cb.httpCallComplete(null);
          cb=null;
        }
        return null;
      }
      reader=new BufferedReader(new InputStreamReader(inputStream));
      String inputLine;
      while ((inputLine=reader.readLine()) != null)       buffer.append(inputLine + "String_Node_Str");
      if (buffer.length() == 0) {
        if (cb != null) {
          cb.httpCallComplete(null);
          cb=null;
        }
        return null;
      }
      String response=null;
      response=buffer.toString();
      if (cb != null) {
        cb.httpCallComplete(response);
        cb=null;
      }
      return response;
    }
 else {
      if (cb != null) {
        cb.httpFailure(responseCode);
        cb=null;
      }
      Log.e(TAG,"String_Node_Str" + responseCode);
      return null;
    }
  }
 catch (  IOException e) {
    e.printStackTrace();
  }
catch (  NullPointerException e) {
    e.printStackTrace();
    urlConnection=null;
  }
 finally {
    if (urlConnection != null) {
      urlConnection.disconnect();
    }
    if (reader != null) {
      try {
        reader.close();
      }
 catch (      final IOException e) {
        Log.e(TAG,"String_Node_Str",e);
      }
    }
    if (cb != null) {
      cb.httpFailure(-1);
    }
  }
  return null;
}