Index: /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestCtrl.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestCtrl.cpp	(revision 33899)
+++ /trunk/src/VBox/Frontends/VBoxManage/VBoxManageGuestCtrl.cpp	(revision 33900)
@@ -1293,9 +1293,9 @@
                  || !strcmp(a->argv[i], "-m"))
         {
-            if (i + 1 >= a->argc)
+            if (i + 1 >= a->argc
+                || RTStrToUInt32Full(a->argv[i + 1], 10, &uMode) != VINF_SUCCESS)
                 usageOK = false;
             else
             {
-                uMode = atoi(a->argv[i + 1]);
                 ++i;
             }