#fixed code
                                private List<OSFileStore> getWmiVolumes() {
        Map<String, List<Object>> drives;
        List<OSFileStore> fs;
        String volume;
        long free;
        long total;

        fs = new ArrayList<>();

        drives = WmiUtil.selectObjectsFrom(null, "Win32_LogicalDisk", FS_PROPERTIES, null, FS_TYPES);

        for (int i = 0; i < drives.get(NAME_PROPERTY).size(); i++) {
            free = (Long) drives.get(FREESPACE_PROPERTY).get(i);
            total = (Long) drives.get(SIZE_PROPERTY).get(i);
            String description = (String) drives.get(DESCRIPTION_PROPERTY).get(i);
            String name = (String) drives.get(NAME_PROPERTY).get(i);
            long type = (Long) drives.get(DRIVE_TYPE_PROPERTY).get(i);
            if (type != 4) {
                char[] chrVolume = new char[BUFSIZE];
                Kernel32.INSTANCE.GetVolumeNameForVolumeMountPoint(name + "\\", chrVolume, BUFSIZE);
                volume = new String(chrVolume).trim();
            } else {
                volume = (String) drives.get(PROVIDER_NAME_PROPERTY).get(i);
                String[] split = volume.split("\\\\");
                if (split.length > 1 && split[split.length - 1].length() > 0) {
                    description = split[split.length - 1];
                }
            }

            fs.add(new OSFileStore(String.format("%s (%s)", description, name), volume, name + "\\", getDriveType(name),
                    (String) drives.get(FILESYSTEM_PROPERTY).get(i), "", free, total));
        }
        return fs;
    }
#vulnerable code 
                                private List<OSFileStore> getWmiVolumes() {
        Map<String, List<String>> drives;
        List<OSFileStore> fs;
        String volume;
        long free;
        long total;

        fs = new ArrayList<>();

        drives = WmiUtil.selectStringsFrom(null, "Win32_LogicalDisk",
                "Name,Description,ProviderName,FileSystem,Freespace,Size", null);

        for (int i = 0; i < drives.get("Name").size(); i++) {
            free = ParseUtil.parseLongOrDefault(drives.get("Freespace").get(i), 0L);
            total = ParseUtil.parseLongOrDefault(drives.get("Size").get(i), 0L);
            String description = drives.get("Description").get(i);

            long type = WmiUtil.selectUint32From(null, "Win32_LogicalDisk", "DriveType",
                    "WHERE Name = '" + drives.get("Name").get(i) + "'");
            if (type != 4) {
                char[] chrVolume = new char[BUFSIZE];
                Kernel32.INSTANCE.GetVolumeNameForVolumeMountPoint(drives.get("Name").get(i) + "\\", chrVolume,
                        BUFSIZE);
                volume = new String(chrVolume).trim();
            } else {
                volume = drives.get("ProviderName").get(i);
                String[] split = volume.split("\\\\");
                if (split.length > 1 && split[split.length - 1].length() > 0) {
                    description = split[split.length - 1];
                }
            }

            fs.add(new OSFileStore(String.format("%s (%s)", description, drives.get("Name").get(i)), volume,
                    drives.get("Name").get(i) + "\\", getDriveType(drives.get("Name").get(i)),
                    drives.get("FileSystem").get(i), "", free, total));
        }
        return fs;
    } 
                            #location 13 
                            #vulnerability type NULL_DEREFERENCE