#vulnerable code 
                               public boolean execute(DiagnosticContext context) {

      if (context.getInputParams().isSkipLogs()) {
         return true;
      }

      JsonNode diagNode = context.getTypedAttribute("diagNode", JsonNode.class);
      boolean getAccess = context.getInputParams().isAccessLogs();
      String commercialDir = SystemUtils.safeToString(context.getAttribute("commercialDir"));
      logger.info("Processing logs and configuration files.");
      JsonNode settings = diagNode.path("settings");
      String name = diagNode.path("name").asText();
      context.setAttribute("diagNodeName", name);

      String clusterName = context.getClusterName();
      JsonNode nodePaths = settings.path("path");
      JsonNode defaultPaths = settings.path("default").path("path");

      String config = nodePaths.path("config").asText();
      String logs = nodePaths.path("logs").asText();
      String conf = nodePaths.path("conf").asText();
      String home = nodePaths.path("home").asText();
      String defaultLogs = defaultPaths.path("logs").asText();
      String defaultConf = defaultPaths.path("conf").asText();

      try {
         List<String> fileDirs = new ArrayList<>();
         context.setAttribute("tempFileDirs", fileDirs);

         // Create a directory for this node
         String nodeDir = context.getTempDir() + SystemProperties.fileSeparator + name + Constants.logDir;
         fileDirs.add(nodeDir);

         Files.createDirectories(Paths.get(nodeDir));
         FileFilter configFilter = new WildcardFileFilter("*.yml");
         String configFileLoc = determineConfigLocation(conf, config, home, defaultConf);
         logs = determineLogLocation(home, logs, defaultLogs);

         // Copy the config directory
         String configDest = nodeDir + SystemProperties.fileSeparator + "config";
         FileUtils.copyDirectory(new File(configFileLoc), new File(configDest), configFilter, true);

         if (commercialDir != "") {
            File comm = new File(configFileLoc + SystemProperties.fileSeparator + commercialDir);
            if (comm.exists()) {
               FileUtils.copyDirectory(comm, new File(configDest + SystemProperties.fileSeparator + commercialDir), true);
            }
         }

         File scripts = new File(configFileLoc + SystemProperties.fileSeparator + "scripts");
         if (scripts.exists()) {
            FileUtils.copyDirectory(scripts, new File(configDest + SystemProperties.fileSeparator + "scripts"), true);
         }

         // Creat the temp directory for the logs
         File logDir = new File(logs);
         File logDest = new File(nodeDir + SystemProperties.fileSeparator + "logs");

         if (context.getInputParams().isArchivedLogs()) {
            FileUtils.copyDirectory(logDir, logDest, true);
         } else {
            //Get the top level log, slow search, and slow index logs
            FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + ".log"), logDest);
            FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + "_index_indexing_slowlog.log"), logDest);
            FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + "_index_search_slowlog.log"), logDest);

            if (getAccess) {
               FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + "_access.log"), logDest);
            }
            int majorVersion = Integer.parseInt(context.getVersion().split("\\.")[0]);
            String patternString = null;
            if (majorVersion > 2) {
               patternString = clusterName + "-\\d{4}-\\d{2}-\\d{2}.log*";
            } else {
               patternString = clusterName + ".log.\\d{4}-\\d{2}-\\d{2}";
            }
            // Get the two most recent server log rollovers
            //Pattern pattern = Pattern.compile(patternString);
            FileFilter logFilter = new RegexFileFilter(patternString);
            File[] logDirList = logDir.listFiles(logFilter);
            Arrays.sort(logDirList, LastModifiedFileComparator.LASTMODIFIED_REVERSE);

            int limit = 2, count = 0;
            for (File logListing : logDirList) {
               if (count < limit) {
                  FileUtils.copyFileToDirectory(logListing, logDest);
                  count++;
               } else {
                  break;
               }
            }
         }


      } catch (Exception e) {
         logger.error("Error processing log and config files.", e);
      }

      logger.info("Finished processing logs and configuration files.");

      return true;
   } 
                            #location 11 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                               public boolean execute(DiagnosticContext context) {

      if (context.getInputParams().isSkipLogs() || ! context.isProcessLocal()) {
         return true;
      }

      JsonNode diagNode = context.getTypedAttribute("diagNode", JsonNode.class);
      if(diagNode == null){
         logger.error("Could not locate node running on current host.");
            return true;
      }

      boolean getAccess = context.getInputParams().isAccessLogs();
      String commercialDir = SystemUtils.safeToString(context.getAttribute("commercialDir"));
      logger.info("Processing logs and configuration files.");

      JsonNode settings = diagNode.path("settings");
      Iterator<JsonNode> inputArgs = diagNode.path("jvm").path("input_arguments").iterator();

      String name = diagNode.path("name").asText();
      context.setAttribute("diagNodeName", name);

      String clusterName = context.getClusterName();
      JsonNode nodePaths = settings.path("path");
      JsonNode defaultPaths = settings.path("default").path("path");

      String inputArgsConfig = findConfigArg(inputArgs);
      String config = nodePaths.path("config").asText();
      String logs = nodePaths.path("logs").asText();
      String conf = nodePaths.path("conf").asText();
      String home = nodePaths.path("home").asText();
      String defaultLogs = defaultPaths.path("logs").asText();
      String defaultConf = defaultPaths.path("conf").asText();

      try {
         List<String> fileDirs = new ArrayList<>();
         context.setAttribute("tempFileDirs", fileDirs);

         // Create a directory for this node
         String nodeDir = context.getTempDir() + SystemProperties.fileSeparator + name + Constants.logDir;
         fileDirs.add(nodeDir);

         Files.createDirectories(Paths.get(nodeDir));
         FileFilter configFilter = new WildcardFileFilter("*.yml");
         String configFileLoc = determineConfigLocation(conf, config, home, defaultConf, inputArgsConfig);

         // Process the config directory
         String configDest = nodeDir + SystemProperties.fileSeparator + "config";
         File configDir = new File(configFileLoc);
         if(configDir.exists() && configDir.listFiles().length > 0){

           FileUtils.copyDirectory(configDir, new File(configDest), configFilter, true);

            if (commercialDir != "") {
               File comm = new File(configFileLoc + SystemProperties.fileSeparator + commercialDir);
               if (comm.exists()) {
                  FileUtils.copyDirectory(comm, new File(configDest + SystemProperties.fileSeparator + commercialDir), true);
               }
            }

            File scripts = new File(configFileLoc + SystemProperties.fileSeparator + "scripts");
            if (scripts.exists()) {
               FileUtils.copyDirectory(scripts, new File(configDest + SystemProperties.fileSeparator + "scripts"), true);
            }
         }

         File logDest = new File(nodeDir + SystemProperties.fileSeparator + "logs");
         logs = determineLogLocation(home, logs, defaultLogs);
         File logDir = new File(logs);
         if (logDir.exists() && logDir.listFiles().length > 0) {
            if (context.getInputParams().isArchivedLogs()) {
               FileUtils.copyDirectory(logDir, logDest, true);
            } else {
               //Get the top level log, slow search, and slow index logs
               FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + ".log"), logDest);
               FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + "_index_indexing_slowlog.log"), logDest);
               FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + "_index_search_slowlog.log"), logDest);

               if (getAccess) {
                  FileUtils.copyFileToDirectory(new File(logs + SystemProperties.fileSeparator + clusterName + "_access.log"), logDest);
               }
               int majorVersion = Integer.parseInt(context.getVersion().split("\\.")[0]);
               String patternString = null;
               if (majorVersion > 2) {
                  patternString = clusterName + "-\\d{4}-\\d{2}-\\d{2}.log*";
               } else {
                  patternString = clusterName + ".log.\\d{4}-\\d{2}-\\d{2}";
               }
               // Get the two most recent server log rollovers
               //Pattern pattern = Pattern.compile(patternString);
               FileFilter logFilter = new RegexFileFilter(patternString);
               File[] logDirList = logDir.listFiles(logFilter);
               Arrays.sort(logDirList, LastModifiedFileComparator.LASTMODIFIED_REVERSE);

               int limit = 2, count = 0;
               for (File logListing : logDirList) {
                  if (count < limit) {
                     FileUtils.copyFileToDirectory(logListing, logDest);
                     count++;
                  } else {
                     break;
                  }
               }
            }
         }
         else {
            logger.error("Configured log directory is not readable or does not exist: " + logDir.getAbsolutePath());
         }

      } catch (Exception e) {
         logger.error("Error processing log and config files.", e);
      }

      logger.info("Finished processing logs and configuration files.");

      return true;
   }