diff -up xorg-server-1.1.1/Xext/cup.c.jx xorg-server-1.1.1/Xext/cup.c
--- xorg-server-1.1.1/Xext/cup.c.jx 2006-07-05 14:31:36.000000000 -0400
+++ xorg-server-1.1.1/Xext/cup.c 2007-12-11 14:28:37.000000000 -0500
@@ -198,6 +198,9 @@ int ProcGetReservedColormapEntries(
REQUEST_SIZE_MATCH (xXcupGetReservedColormapEntriesReq);
+ if (stuff->screen >= screenInfo.numScreens)
+ return BadValue;
+
#ifndef HAVE_SPECIAL_DESKTOP_COLORS
citems[CUP_BLACK_PIXEL].pixel =
screenInfo.screens[stuff->screen]->blackPixel;