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Fix null pointer access in QQuickOpenGLShaderEffectMaterialCache 

If a QQuickWindow is destroyed without ever being rendered, then there won't be
any QOpenGLContext in QQuickOpenGLShaderEffectMaterial::cleanupMaterialCache.

Same goes for QQuickWidgetRenderControl.

Fixes: QTBUG-65236
Change-Id: I2742505d147bc8444b46688170d33fbb2844f2ac
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Jüri Valdmann 2018-11-07 11:56:48 +01:00
parent 74a5ce0266
commit 6c08137faf
3 changed files with 5 additions and 2 deletions
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1
src/quick/items/qquickopenglshadereffectnode.cpp
View File

@ -366,6 +366,7 @@ class QQuickOpenGLShaderEffectMaterialCache : public QObject
public:
static QQuickOpenGLShaderEffectMaterialCache *get(bool create = true) {
QOpenGLContext *ctx = QOpenGLContext::currentContext();
Q_ASSERT(ctx);
QQuickOpenGLShaderEffectMaterialCache *me = ctx->findChild<QQuickOpenGLShaderEffectMaterialCache *>(QStringLiteral("__qt_ShaderEffectCache"), Qt::FindDirectChildrenOnly);
if (!me && create) {
me = new QQuickOpenGLShaderEffectMaterialCache();

3
src/quick/items/qquickrendercontrol.cpp
View File

@ -192,7 +192,8 @@ void QQuickRenderControlPrivate::windowDestroyed()
QQuickWindowPrivate::get(window)->animationController = nullptr;
#if QT_CONFIG(quick_shadereffect) && QT_CONFIG(opengl)
QQuickOpenGLShaderEffectMaterial::cleanupMaterialCache();
if (QOpenGLContext::currentContext())
QQuickOpenGLShaderEffectMaterial::cleanupMaterialCache();
#endif
window = nullptr;

3
src/quick/scenegraph/qsgrenderloop.cpp
View File

@ -334,7 +334,8 @@ void QSGGuiThreadRenderLoop::windowDestroyed(QQuickWindow *window)
qCDebug(QSG_LOG_RENDERLOOP, "cleanup without an OpenGL context");
#if QT_CONFIG(quick_shadereffect) && QT_CONFIG(opengl)
QQuickOpenGLShaderEffectMaterial::cleanupMaterialCache();
if (current)
QQuickOpenGLShaderEffectMaterial::cleanupMaterialCache();
#endif
d->cleanupNodesOnShutdown();