[Libreoffice-commits] core.git: Branch 'distro/lhm/libreoffice-6-4+backports' - fpicker/source

[Samuel Mehrbrodt (via logerrit)]

 fpicker/source/win32/VistaFilePickerImpl.cxx |   16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

New commits:
commit 06ea737787dd0e1cd926dfee240538b7ddef1f64
Author:     Samuel Mehrbrodt <samuel.mehrbrodt at allotropia.de>
AuthorDate: Tue Feb 23 10:28:18 2021 +0100
Commit:     Thorsten Behrens <thorsten.behrens at allotropia.de>
CommitDate: Fri Feb 26 00:31:49 2021 +0100

    Possible race between retrieving and using parent window
    
    Filepicker was called from extension, parent window was initialized in constructor
    with current top level window (extension dialog).
    Extension dialog got closed before file picker was shown in some cases,
    causing Show() method to fail
    
    Change-Id: Ie41585e6b05511ba2dff265374348b6041e9fa87
    Reviewed-on: https://gerrit.libreoffice.org/c/core/+/111379
    Tested-by: Thorsten Behrens <thorsten.behrens at allotropia.de>
    Reviewed-by: Thorsten Behrens <thorsten.behrens at allotropia.de>

diff --git a/fpicker/source/win32/VistaFilePickerImpl.cxx b/fpicker/source/win32/VistaFilePickerImpl.cxx
index 3c3286fe2f14..941a8c64d44c 100644
--- a/fpicker/source/win32/VistaFilePickerImpl.cxx
+++ b/fpicker/source/win32/VistaFilePickerImpl.cxx
@@ -187,10 +187,10 @@ VistaFilePickerImpl::VistaFilePickerImpl()
     , m_iEventHandler(new VistaFilePickerEventHandler(this))
     , m_bInExecute   (false)
     , m_bWasExecuted (false)
+    , m_hParentWindow(nullptr)
     , m_sDirectory   ()
     , m_sFilename    ()
 {
-    m_hParentWindow = choose_parent_window();
 }
 
 
@@ -1026,19 +1026,25 @@ void VistaFilePickerImpl::impl_sta_ShowDialogModal(const RequestRef& rRequest)
         }
     }
 
-
     HRESULT hResult = E_FAIL;
+    HWND hParentWindow;
+    {
+        osl::MutexGuard aLock(m_aMutex);
+        // Note that there is a potential race between retrieving and
+        // using parent window (window might get destroyed)
+        hParentWindow = m_hParentWindow ? m_hParentWindow : choose_parent_window();
+    }
     try
     {
         // show dialog and wait for user decision
         if (iOpen.is())
-            hResult = iOpen->Show( m_hParentWindow ); // parent window needed
+            hResult = iOpen->Show( hParentWindow ); // parent window needed
         else
         if (iSave.is())
-            hResult = iSave->Show( m_hParentWindow ); // parent window needed
+            hResult = iSave->Show( hParentWindow ); // parent window needed
         else
         if (iPick.is())
-            hResult = iPick->Show( m_hParentWindow ); // parent window needed
+            hResult = iPick->Show( hParentWindow ); // parent window needed
     }
     catch(...)
     {}