From 60fe6427da0131438086ba4da63b67a4aa32c035 Mon Sep 17 00:00:00 2001
From: "Darryl L. Miles" <darryl.miles@darrylmiles.org>
Date: Sun, 29 Sep 2024 23:00:00 +0100
Subject: [PATCH] graphics/grX11su1.c: Dereference of null pointer

Looks like the code below requires w!=NULL to do anything useful.
So when w==NULL we don't continue processing X11 Event.

SonarCloud
graphics/grX11su1.c:895 Dereference of null pointer
https://sonarcloud.io/project/issues?open=AZJB163RNGfDNup0Ri4p&id=dlmiles_magic
---
 graphics/grX11su1.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/graphics/grX11su1.c b/graphics/grX11su1.c
index 560ec71e..181143ba 100644
--- a/graphics/grX11su1.c
+++ b/graphics/grX11su1.c
@@ -890,6 +890,8 @@ grX11Stdin()
 
 		entry = HashLookOnly(&grX11WindowTable, VisEvent->window);
 		w = (entry)?(MagWindow *)HashGetValue(entry):0;
+		if(!w)
+		    break;
 
 		switch(VisEvent->state)
 		{