Program: 21277
Project: 21277
Buggy source:
@Override public void handleFree(DownloadLink parameter) throws Exception {
  if (parameter.getDownloadURL().matches("String_Node_Str")) {
    ((PluginForHost)PluginWrapper.getNewInstance("String_Node_Str")).handleFree(parameter);
    return;
  }
  br.setFollowRedirects(true);
  br.getPage(parameter.getDownloadURL());
  if (br.containsHTML(NOT_AVAILABLE)) {
    throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
  }
 else   if (br.containsHTML(SERVER_DOWN) || br.containsHTML(NO_SLOT)) {
    throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,20 * 60 * 1000l);
  }
  br.getPage(Encoding.htmlDecode("String_Node_Str" + br.getRegex(baseLink).getMatch(0)));
  br.setCookie(br.getURL(),"String_Node_Str","String_Node_Str");
  br.getPage(Encoding.htmlDecode("String_Node_Str" + br.getRegex(frameForCaptcha).getMatch(0)));
  File captchaFile=this.getLocalCaptchaFile(this);
  Browser.download(captchaFile,Encoding.htmlDecode("String_Node_Str" + br.getRegex(patternForCaptcha).getMatch(0)));
  String captchaCode=Plugin.getCaptchaCode(captchaFile,this,parameter);
  Form captchaForm=br.getForm(0);
  captchaForm.put("String_Node_Str",captchaCode);
  br.submitForm(captchaForm);
  if (br.containsHTML(CAPTCHA_WRONG)) {
    throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  }
  br.openPostConnection(Encoding.htmlDecode(br.getRegex(patternForDownloadlink).getMatch(0)),"String_Node_Str");
  if (br.getHttpConnection().isContentDisposition()) {
    dl=new RAFDownload(this,parameter,br.getHttpConnection());
    dl.startDownload();
  }
 else {
    br.followConnection();
    if (br.containsHTML(DOWNLOAD_LIMIT)) {
      logger.info("String_Node_Str");
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,Regex.getMilliSeconds(br.getRegex(WAIT_TIME).getMatch(0)));
    }
 else     if (br.containsHTML(PATTERN_DOWNLOADING_TOO_MANY_FILES)) {
      logger.info("String_Node_Str");
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,60 * 1000l);
    }
  }
}

Fixed version (ground truth):
@Override public void handleFree(DownloadLink parameter) throws Exception {
  if (parameter.getDownloadURL().matches("String_Node_Str")) {
    ((PluginForHost)PluginWrapper.getNewInstance("String_Node_Str")).handleFree(parameter);
    return;
  }
  br.setFollowRedirects(true);
  br.getPage(parameter.getDownloadURL());
  if (br.containsHTML("String_Node_Str")) {
    throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,3 * 60 * 1000l);
  }
  if (br.containsHTML(NOT_AVAILABLE)) {
    throw new PluginException(LinkStatus.ERROR_FILE_NOT_FOUND);
  }
 else   if (br.containsHTML(SERVER_DOWN) || br.containsHTML(NO_SLOT)) {
    throw new PluginException(LinkStatus.ERROR_TEMPORARILY_UNAVAILABLE,20 * 60 * 1000l);
  }
  br.getPage(Encoding.htmlDecode("String_Node_Str" + br.getRegex(baseLink).getMatch(0)));
  br.setCookie(br.getURL(),"String_Node_Str","String_Node_Str");
  br.getPage(Encoding.htmlDecode("String_Node_Str" + br.getRegex(frameForCaptcha).getMatch(0)));
  File captchaFile=this.getLocalCaptchaFile(this);
  Browser.download(captchaFile,Encoding.htmlDecode("String_Node_Str" + br.getRegex(patternForCaptcha).getMatch(0)));
  String captchaCode=Plugin.getCaptchaCode(captchaFile,this,parameter);
  Form captchaForm=br.getForm(0);
  captchaForm.put("String_Node_Str",captchaCode);
  br.submitForm(captchaForm);
  if (br.containsHTML(CAPTCHA_WRONG)) {
    throw new PluginException(LinkStatus.ERROR_CAPTCHA);
  }
  br.openPostConnection(Encoding.htmlDecode(br.getRegex(patternForDownloadlink).getMatch(0)),"String_Node_Str");
  if (br.getHttpConnection().isContentDisposition()) {
    dl=new RAFDownload(this,parameter,br.getHttpConnection());
    dl.startDownload();
  }
 else {
    br.followConnection();
    if (br.containsHTML(DOWNLOAD_LIMIT)) {
      logger.info("String_Node_Str");
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,Regex.getMilliSeconds(br.getRegex(WAIT_TIME).getMatch(0)));
    }
 else     if (br.containsHTML(PATTERN_DOWNLOADING_TOO_MANY_FILES)) {
      logger.info("String_Node_Str");
      throw new PluginException(LinkStatus.ERROR_IP_BLOCKED,60 * 1000l);
    }
  }
}