1 files changed, 3 insertions, 0 deletions
diff --git a/dix/pixmap.c b/dix/pixmap.c
index f76c557f4..78ce2a8c6 100644
--- a/dix/pixmap.c
+++ b/dix/pixmap.c
@@ -118,6 +118,9 @@ AllocatePixmap(ScreenPtr pScreen, int pixDataSize)
     unsigned size;
     int i;
 
+    if (pScreen->totalPixmapSize > ((size_t)-1) - pixDataSize)
+	return NullPixmap;
+    
     pPixmap = (PixmapPtr)xalloc(pScreen->totalPixmapSize + pixDataSize);
     if (!pPixmap)
 	return NullPixmap;