From da12d3804f1a37d28333a7728a22e91cbf44ecc0 Mon Sep 17 00:00:00 2001
From: Vlad Zahorodnii <vlad.zahorodnii@kde.org>
Date: Fri, 16 Oct 2020 19:30:37 +0300
Subject: [PATCH] Fix a potential SIGSEGV

Compositor::self()->scene() may return nullptr while compositing is
being restarted.
---
 platform.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/platform.cpp b/platform.cpp
index e001c4e288..a9e3cd6697 100644
--- a/platform.cpp
+++ b/platform.cpp
@@ -415,8 +415,12 @@ void Platform::warpPointer(const QPointF &globalPos)
 
 bool Platform::supportsSurfacelessContext() const
 {
-    if (Compositor *c = Compositor::self()) {
-        return c->scene()->supportsSurfacelessContext();
+    Compositor *compositor = Compositor::self();
+    if (Q_UNLIKELY(!compositor)) {
+        return false;
+    }
+    if (Scene *scene = compositor->scene()) {
+        return scene->supportsSurfacelessContext();
     }
     return false;
 }