From f61d3ade84989c3aecc2a60e980c680cff57f331 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Thomas=20L=C3=BCbking?= <thomas.luebking@gmail.com>
Date: Thu, 8 Jan 2015 00:25:46 +0100
Subject: [PATCH] shortcut rendering textures for empty an rect

it makes no sense and there's a good chance
that in this case m_vbo is still nullptr and
it will not be created since d->m_cachedSize
will be an empty size as well
-> nullptr access -> crash

BUG: 337090
FIXED-IN: 5.2
---
 libkwineffects/kwingltexture.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libkwineffects/kwingltexture.cpp b/libkwineffects/kwingltexture.cpp
index 5ce633a41f..ad6afffd17 100644
--- a/libkwineffects/kwingltexture.cpp
+++ b/libkwineffects/kwingltexture.cpp
@@ -447,6 +447,8 @@ void GLTexture::unbind()
 void GLTexture::render(QRegion region, const QRect& rect, bool hardwareClipping)
 {
     Q_D(GLTexture);
+    if (rect.isEmpty())
+        return; // nothing to paint and m_vbo is likely nullptr and d->m_cachedSize empty as well, #337090
     if (rect.size() != d->m_cachedSize) {
         d->m_cachedSize = rect.size();
         QRect r(rect);