Merge remote-tracking branch 'origin/5.6' into 5.7

Change-Id: I1a63523de158757964b6fb5ea026cf69a6c5ddcf

1 files changed, 6 insertions, 2 deletions

diff --git a/src/platformsupport/input/evdevtouch/qevdevtouchhandler.cpp b/src/platformsupport/input/evdevtouch/qevdevtouchhandler.cpp
index 6b98ed30a9..435f411f96 100644
--- a/src/platformsupport/input/evdevtouch/qevdevtouchhandler.cpp
+++ b/src/platformsupport/input/evdevtouch/qevdevtouchhandler.cpp
@@ -400,9 +400,13 @@ void QEvdevTouchScreenHandler::unregisterTouchDevice()
     if (!m_device)
         return;
 
-    QWindowSystemInterface::unregisterTouchDevice(m_device);
+    // At app exit the cleanup may have already been done, avoid
+    // double delete by checking the list first.
+    if (QWindowSystemInterface::isTouchDeviceRegistered(m_device)) {
+        QWindowSystemInterface::unregisterTouchDevice(m_device);
+        delete m_device;
+    }
 
-    delete m_device;
     m_device = Q_NULLPTR;
 }