MDL-15184: fix sql injection vulnerability

mod/hotpot/report.php

@@ -380,10 +380,14 @@ function hotpot_delete_selected_attempts(&$hotpot, $del) {
             $select = "hotpot='$hotpot->id' AND status=".HOTPOT_STATUS_ABANDONED;
             break;
         case 'selection':
-            $ids = (array)data_submitted();
-            unset($ids['del']);
-            unset($ids['id']);
-            if (!empty($ids)) {
+            $ids = array();
+            $data = (array)data_submitted();
+            foreach ($data as $name => $value) {
+                if (preg_match('/^box\d+$/', $name)) {
+                    $ids[] = intval($value);
+                }
+            }
+            if (count($ids)) {
                 $select = "hotpot='$hotpot->id' AND clickreportid IN (".implode(',', $ids).")";
             }
             break;
@@ -391,7 +395,7 @@ function hotpot_delete_selected_attempts(&$hotpot, $del) {
 
     // delete attempts using $select, if it is set
     if ($select) {
-
+ 
         $table = 'hotpot_attempts';
         if ($attempts = get_records_select($table, $select)) {