From d04187b6a17c16cc455a330fd3e3350016dcc889 Mon Sep 17 00:00:00 2001
From: Friedemann Kleint <Friedemann.Kleint@qt.io>
Date: Tue, 12 Dec 2017 09:23:04 +0100
Subject: [PATCH] Windows QPA: Check validity of device when handling tablet
 leave

Huion GT-191 has been observed to send spurious leave events.
Amends 127483b5e30de6c1905ea3280dd45a0b7d6a3813.

Task-number: QTBUG-65120
Change-Id: I5dfa003a71be137a7b40cc9c27d7cf2cada6922d
Reviewed-by: Shawn Rutledge <shawn.rutledge@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>
---
 src/plugins/platforms/windows/qwindowstabletsupport.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/plugins/platforms/windows/qwindowstabletsupport.cpp b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
index fba4e8f386..5fdc664603 100644
--- a/src/plugins/platforms/windows/qwindowstabletsupport.cpp
+++ b/src/plugins/platforms/windows/qwindowstabletsupport.cpp
@@ -355,6 +355,8 @@ bool QWindowsTabletSupport::translateTabletProximityEvent(WPARAM /* wParam */, L
 
     if (!LOWORD(lParam)) {
         qCDebug(lcQpaTablet) << "leave proximity for device #" << m_currentDevice;
+        if (m_currentDevice < 0 || m_currentDevice >= m_devices.size()) // QTBUG-65120, spurious leave observed
+            return false;
         if (totalPacks > 0) {
             QWindowSystemInterface::handleTabletLeaveProximityEvent(proximityBuffer[0].pkTime,
                                                                     m_devices.at(m_currentDevice).currentDevice,