[v3 PATCH 1/2] mfreadwrite/reader: Make the stream sample allocator callback own a reference to the source reader.

[Nikolay Sivov]

From: Giovanni Mascellani

The stream sample allocator callback NotifyRelease() method assumes that
the source reader is valid. Therefore it must own a reference to it,
otherwise it might get called while the source reader is being destroyed,
causing a crash.

Signed-off-by: Giovanni Mascellani 
Signed-off-by: Nikolay Sivov 
---
 dlls/mfreadwrite/reader.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/dlls/mfreadwrite/reader.c b/dlls/mfreadwrite/reader.c
index bdf2e7f5a6f..2d3da19db10 100644
--- a/dlls/mfreadwrite/reader.c
+++ b/dlls/mfreadwrite/reader.c
@@ -2282,12 +2282,14 @@ static HRESULT WINAPI stream_sample_allocator_cb_QueryInterface(IMFVideoSampleAl

static ULONG WINAPI stream_sample_allocator_cb_AddRef(IMFVideoSampleAllocatorNotify *iface)
 {
-    return 2;
+    struct media_stream *stream = impl_stream_from_IMFVideoSampleAllocatorNotify(iface);
+    return source_reader_addref(stream->reader);
 }

static ULONG WINAPI stream_sample_allocator_cb_Release(IMFVideoSampleAllocatorNotify *iface)
 {
-    return 1;
+    struct media_stream *stream = impl_stream_from_IMFVideoSampleAllocatorNotify(iface);
+    return source_reader_release(stream->reader);
 }

static HRESULT WINAPI stream_sample_allocator_cb_NotifyRelease(IMFVideoSampleAllocatorNotify *iface)