mfplat: Read queue subscriber within the critical section.

Signed-off-by: Rémi Bernon <rbernon@codeweavers.com> Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com> Signed-off-by: Alexandre Julliard <julliard@winehq.org>

mfplat: Read queue subscriber within the critical section.
4904d908 · Rémi Bernon · Alexandre Julliard · a8d4ea1d · 4904d908
Commit 4904d908 authored Apr 12, 2021 by Rémi Bernon Committed by Alexandre Julliard Apr 12, 2021
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main.c dlls/mfplat/main.c +2 -2

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--- a/dlls/mfplat/main.c
+++ b/dlls/mfplat/main.c
@@ -7109,7 +7109,7 @@ static void queue_notify_subscriber(struct event_queue *queue)
 static HRESULT WINAPI eventqueue_BeginGetEvent(IMFMediaEventQueue *iface, IMFAsyncCallback *callback, IUnknown *state)
 {
    struct event_queue *queue = impl_from_IMFMediaEventQueue(iface);
-    MFASYNCRESULT *result_data = (MFASYNCRESULT *)queue->subscriber;
+    MFASYNCRESULT *result_data;
    HRESULT hr;
    TRACE("%p, %p, %p.\n", iface, callback, state);
@@ -7121,7 +7121,7 @@ static HRESULT WINAPI eventqueue_BeginGetEvent(IMFMediaEventQueue *iface, IMFAsy
    if (queue->is_shut_down)
        hr = MF_E_SHUTDOWN;
-    else if (result_data)
+    else if ((result_data = (MFASYNCRESULT *)queue->subscriber))
    {
        if (result_data->pCallback == callback)
            hr = IRtwqAsyncResult_GetStateNoAddRef(queue->subscriber) == state ?