From 37b7c5164c830458ea833d3757ca94cb7bebcb3a Mon Sep 17 00:00:00 2001
From: Shawn Rutledge <shawn.rutledge@digia.com>
Date: Tue, 10 Mar 2015 14:51:19 +0100
Subject: [PATCH] xcb: another QXcbScreen null pointer check

In QXcbWindow::setParent(), the window may not have a screen,
and in that case we cannot get the root window in this way.

Task-number: QTBUG-44719
Change-Id: I719e5e2f8cad13b1460b4d9df6ffd6c4a48e0d37
Reviewed-by: Laszlo Agocs <laszlo.agocs@theqtcompany.com>
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
---
 src/plugins/platforms/xcb/qxcbwindow.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index e2b104e3f1..41b24e302f 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -1371,6 +1371,8 @@ void QXcbWindow::setParent(const QPlatformWindow *parent)
         xcb_parent_id = qXcbParent->xcb_window();
         m_embedded = qXcbParent->window()->type() == Qt::ForeignWindow;
     } else {
+        if (!xcbScreen())
+            return;
         xcb_parent_id = xcbScreen()->root();
         m_embedded = false;
     }