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-rw-r--r--Xext/cup.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/Xext/cup.c b/Xext/cup.c
index 79e11deff..7a81f5e3a 100644
--- a/Xext/cup.c
+++ b/Xext/cup.c
@@ -176,6 +176,9 @@ 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;