From a63ad78ed31e36dbdf3a9cd28071dcdbefce7d19 Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Wed, 31 Aug 2022 12:01:54 +0100
Subject: [PATCH] patch 9.0.0339: no check if the return value of XChangeGC()
 is NULL

Problem:    No check if the return value of XChangeGC() is NULL.
Solution:   Only use the return value when it is not NULL. (closes #11020)
---
 src/gui_x11.c | 10 +++++++---
 1 files changed, 7 insertions(+), 3 deletions(-)

diff --git a/src/gui_x11.c b/src/gui_x11.c
index 6e3e903be462..7293ac4900a6 100644
--- a/src/gui_x11.c
+++ b/src/gui_x11.c
@@ -2231,10 +2231,14 @@ gui_x11_create_blank_mouse(void)
 {
     Pixmap blank_pixmap = XCreatePixmap(gui.dpy, gui.wid, 1, 1, 1);
     GC gc = XCreateGC(gui.dpy, blank_pixmap, (unsigned long)0, (XGCValues*)0);
-    XDrawPoint(gui.dpy, blank_pixmap, gc, 0, 0);
-    XFreeGC(gui.dpy, gc);
+
+    if (gc != NULL)
+    {
+	XDrawPoint(gui.dpy, blank_pixmap, gc, 0, 0);
+	XFreeGC(gui.dpy, gc);
+    }
     return XCreatePixmapCursor(gui.dpy, blank_pixmap, blank_pixmap,
-	    (XColor*)&gui.norm_pixel, (XColor*)&gui.norm_pixel, 0, 0);
+		     (XColor*)&gui.norm_pixel, (XColor*)&gui.norm_pixel, 0, 0);
 }
 
 /*