From 77502c6836e4532a73c7d7484bc344030bd4bf71 Mon Sep 17 00:00:00 2001
From: "Enrico Weigelt, metux IT consult" <info@metux.net>
Date: Wed, 7 May 2025 12:53:08 +0200
Subject: [PATCH] dix: NULL-protect AllocGlyphCursor()

Return error to the client if sourcefont turns out to be NULL for
whatever reason.

Signed-off-by: Enrico Weigelt, metux IT consult <info@metux.net>
---
 dix/cursor.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dix/cursor.c b/dix/cursor.c
index f12c50971..8d8bfeb8c 100644
--- a/dix/cursor.c
+++ b/dix/cursor.c
@@ -339,7 +339,7 @@ AllocGlyphCursor(Font source, unsigned sourceChar, Font mask, unsigned maskChar,
 
     rc = dixLookupResourceByType((void **) &sourcefont, source, X11_RESTYPE_FONT,
                                  client, DixUseAccess);
-    if (rc != Success) {
+    if ((rc != Success) || (!sourcefont)) {
         client->errorValue = source;
         return rc;
     }