librenms-librenms/html/includes/graphs/diskio/auth.inc.php

<?php

if (is_numeric($vars['id'])) {
    $disk = dbFetchRow('SELECT * FROM `ucd_diskio` AS U, `devices` AS D WHERE U.diskio_id = ? AND U.device_id = D.device_id', array($vars['id']));

    if (is_numeric($disk['device_id']) && ($auth || device_permitted($disk['device_id']))) {
        $device = device_by_id_cache($disk['device_id']);

        $rrd_filename = $config['rrd_dir'].'/'.$disk['hostname'].'/ucd_diskio-'.safename($disk['diskio_descr'].'.rrd');

        $title  = generate_device_link($device);
        $title .= ' :: Disk :: '.htmlentities($disk['diskio_descr']);
        $auth   = true;
    }
}