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Application: prevent crash on startup when "Interface Crashed" dialog is shown.

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If the application "Interface Crashed" dialog is shown at startup, it can cause Application to receive events before it has been fully constructed.
In this case the QMainWindow _window pointer is uninitialized, causing Menu::getInstance() to de-reference an invalid pointer.

The fix for this is three fold.

1. Construct the QMainWindow before calling setupEssentials (which in turn spawns the "Interface Crashed" dialog).
2. Change Menu::getInstance() from a static_cast to a dynamic_cast.  This will cause it to return a nullptr if [QMainWindow::menuBar()](http://doc.qt.io/qt-4.8/qmainwindow.html#menuBar) returns an instance of QMenuBar and not a ui::Menu instance.
3. In Application::event return false if Menu::getInstance() returns a nullptr.  This should prevent any code that relies on having a valid ui::Menu instance from running.
This commit is contained in:
Anthony J. Thibault 2016-03-16 18:03:59 -07:00
parent 35aa074955
commit a8bc8a7843
3 changed files with 9 additions and 4 deletions
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7
interface/src/Application.cpp
View file

@ -452,8 +452,8 @@ Q_GUI_EXPORT void qt_gl_set_global_share_context(QOpenGLContext *context);
Application::Application(int& argc, char** argv, QElapsedTimer& startupTimer) :
QApplication(argc, argv),
_dependencyManagerIsSetup(setupEssentials(argc, argv)),
_window(new MainWindow(desktop())),
_dependencyManagerIsSetup(setupEssentials(argc, argv)),
_undoStackScriptingInterface(&_undoStack),
_frameCount(0),
_fps(60.0f),
@ -1744,6 +1744,11 @@ bool Application::importSVOFromURL(const QString& urlString) {
}
bool Application::event(QEvent* event) {
if (!Menu::getInstance()) {
return false;
}
if ((int)event->type() == (int)Lambda) {
((LambdaEvent*)event)->call();
return true;

4
interface/src/Application.h
View file

@ -381,6 +381,8 @@ private:
void maybeToggleMenuVisible(QMouseEvent* event);
MainWindow* _window;
bool _dependencyManagerIsSetup;
OffscreenGLCanvas* _offscreenContext { nullptr };
@ -390,8 +392,6 @@ private:
bool _activatingDisplayPlugin { false };
QMap<gpu::TexturePointer, gpu::FramebufferPointer> _lockedFramebufferMap;
MainWindow* _window;
QUndoStack _undoStack;
UndoStackScriptingInterface _undoStackScriptingInterface;

2
interface/src/Menu.cpp
View file

@ -46,7 +46,7 @@
#include "Menu.h"
Menu* Menu::getInstance() {
return static_cast<Menu*>(qApp->getWindow()->menuBar());
return dynamic_cast<Menu*>(qApp->getWindow()->menuBar());
}
Menu::Menu() {