Merge remote-tracking branch 'origin/tqtc/lts-5.15.13' into tqtc/lts-5.15-opensourcev5.15.13-lts-lgpl5.15

Change-Id: Ie9df84af22570d601db002e391a1a0d97e7cd9e1

1 files changed, 5 insertions, 0 deletions

diff --git a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
index 754ded14f1..a01104a8e3 100644
--- a/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
+++ b/src/plugins/platforms/windows/uiautomation/qwindowsuiamainprovider.cpp
@@ -74,10 +74,13 @@ QT_BEGIN_NAMESPACE
 
 using namespace QWindowsUiAutomation;
 
+QMutex QWindowsUiaMainProvider::m_mutex;
 
 // Returns a cached instance of the provider for a specific acessible interface.
 QWindowsUiaMainProvider *QWindowsUiaMainProvider::providerForAccessible(QAccessibleInterface *accessible)
 {
+    QMutexLocker locker(&m_mutex);
+
     if (!accessible)
         return nullptr;
 
@@ -271,6 +274,8 @@ ULONG QWindowsUiaMainProvider::AddRef()
 
 ULONG STDMETHODCALLTYPE QWindowsUiaMainProvider::Release()
 {
+    QMutexLocker locker(&m_mutex);
+
     if (!--m_ref) {
         delete this;
         return 0;