From ddd0919bcf5bb630efce755cc21f364e36e23fca Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@qt.io>
Date: Wed, 11 Mar 2020 12:57:41 +0100
Subject: Do not crash on skipped Xlib visuals

If XLIB_SKIP_ARGB_VISUALS is set, we might fail to find visuals for
supported configurations.

Task-number: QTBUG-81904
Change-Id: Ib0d26faabe430925881b7f2acfc5361df3af416b
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
---
 src/platformsupport/glxconvenience/qglxconvenience.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/platformsupport/glxconvenience/qglxconvenience.cpp b/src/platformsupport/glxconvenience/qglxconvenience.cpp
index 81bccb1c25..e2f4922c8a 100644
--- a/src/platformsupport/glxconvenience/qglxconvenience.cpp
+++ b/src/platformsupport/glxconvenience/qglxconvenience.cpp
@@ -224,6 +224,8 @@ GLXFBConfig qglx_findConfig(Display *display, int screen , QSurfaceFormat format
             }
 
             QXlibPointer<XVisualInfo> visual(glXGetVisualFromFBConfig(display, candidate));
+            if (!visual)
+                continue;
             int actualRed;
             int actualGreen;
             int actualBlue;
-- 
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