File xcb-dont-crash-in-mapToNativemapFromNative-if-the-screen-is-null.patch of Package libqt5-qtbase.1959

From c2dd0bb2c7a0468abefb9556dead85456daa851f Mon Sep 17 00:00:00 2001
From: Shawn Rutledge <shawn.rutledge@theqtcompany.com>
Date: Fri, 4 Sep 2015 14:25:15 +0200
Subject: [PATCH] xcb: don't crash in mapToNative/mapFromNative if the screen
 is null

The results will be wrong, but it only happens in rare cases anyway.

Task-number: QTBUG-42985
Task-number: QTBUG-47385
Change-Id: I6438f219f175af2b118e6b3af16b5b626136defa
---
 src/plugins/platforms/xcb/qxcbwindow.cpp | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/src/plugins/platforms/xcb/qxcbwindow.cpp b/src/plugins/platforms/xcb/qxcbwindow.cpp
index 4fdebe1..3b589d2 100644
--- a/src/plugins/platforms/xcb/qxcbwindow.cpp
+++ b/src/plugins/platforms/xcb/qxcbwindow.cpp
@@ -179,6 +179,8 @@ QXcbScreen *QXcbWindow::parentScreen()
 
 QPoint QXcbWindow::mapToNative(const QPoint &pos, const QXcbScreen *screen) const
 {
+    if (!screen)
+        return pos;
     if (parent())
         return pos * int(screen->devicePixelRatio());
     else
@@ -186,6 +188,8 @@ QPoint QXcbWindow::mapToNative(const QPoint &pos, const QXcbScreen *screen) cons
 }
 QPoint QXcbWindow::mapFromNative(const QPoint &pos, const QXcbScreen *screen) const
 {
+    if (!screen)
+        return pos;
     if (parent())
         return pos / int(screen->devicePixelRatio());
     else
@@ -193,6 +197,8 @@ QPoint QXcbWindow::mapFromNative(const QPoint &pos, const QXcbScreen *screen) co
 }
 QRect QXcbWindow::mapToNative(const QRect &rect, const QXcbScreen *screen) const
 {
+    if (!screen)
+        return rect;
     if (parent())
         return mapLocalGeometryToNative(rect, int(screen->devicePixelRatio()));
     else
@@ -200,6 +206,8 @@ QRect QXcbWindow::mapToNative(const QRect &rect, const QXcbScreen *screen) const
 }
 QRect QXcbWindow::mapFromNative(const QRect &rect, const QXcbScreen *screen) const
 {
+    if (!screen)
+        return rect;
     if (parent())
         return mapLocalGeometryFromNative(rect, int(screen->devicePixelRatio()));
     else
-- 
2.3.5