[PATCH v3 1/2] ole32: Leave the RunningObjectTable Critical Section before umarshalling object

[Lorenzo Ferrillo]

From: Lorenzo Ferrillo

Sometimes umarshalling an object from the RunningObjectTable can cause the routine to access the
table back inside another thread, causing a deadlock.
Visual Studio 2019 is an example of this behaviour.

Signed-off-by: Lorenzo Ferrillo 
---
 dlls/ole32/moniker.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/dlls/ole32/moniker.c b/dlls/ole32/moniker.c
index ec026758b2f..06a2ef8de9c 100644
--- a/dlls/ole32/moniker.c
+++ b/dlls/ole32/moniker.c
@@ -541,13 +541,14 @@ RunningObjectTableImpl_GetObject( IRunningObjectTable* iface,
         {
             IStream *pStream;
             hr = create_stream_on_mip_ro(rot_entry->object, &pStream);
+            LeaveCriticalSection(&This->lock);
+            
             if (hr == S_OK)
             {
                 hr = CoUnmarshalInterface(pStream, &IID_IUnknown, (void **)ppunkObject);
                 IStream_Release(pStream);
             }

-            LeaveCriticalSection(&This->lock);
             HeapFree(GetProcessHeap(), 0, moniker_data);

return hr;