Anton Baskanov : amstream: Don't crash if parent is NULL in AMAudioStream:: and AMDirectDrawStream::GetMultiMediaStream.

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: 59adc57590b50df0eaf09d73bb5d8facc9b30a40
URL:    https://source.winehq.org/git/wine.git/?a=commit;h=59adc57590b50df0eaf09d73bb5d8facc9b30a40

Author: Anton Baskanov <baskanov at gmail.com>
Date:   Mon May 25 14:17:33 2020 -0500

amstream: Don't crash if parent is NULL in AMAudioStream:: and AMDirectDrawStream::GetMultiMediaStream.

Signed-off-by: Anton Baskanov <baskanov at gmail.com>
Signed-off-by: Zebediah Figura <z.figura12 at gmail.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
(cherry picked from commit 4300981d6b997c0b4c70c3415d4bbcd694d1a7f1)
Signed-off-by: Michael Stefaniuc <mstefani at winehq.org>

---

 dlls/amstream/audiostream.c | 14 +++++++-------
 dlls/amstream/ddrawstream.c | 14 +++++++-------
 2 files changed, 14 insertions(+), 14 deletions(-)

diff --git a/dlls/amstream/audiostream.c b/dlls/amstream/audiostream.c
index 911cbd4d19f..17723db6c21 100644
--- a/dlls/amstream/audiostream.c
+++ b/dlls/amstream/audiostream.c
@@ -259,18 +259,18 @@ static ULONG WINAPI audio_IAMMediaStream_Release(IAMMediaStream *iface)
 
 /*** IMediaStream methods ***/
 static HRESULT WINAPI audio_IAMMediaStream_GetMultiMediaStream(IAMMediaStream *iface,
-        IMultiMediaStream** multi_media_stream)
+        IMultiMediaStream **mmstream)
 {
-    struct audio_stream *This = impl_from_IAMMediaStream(iface);
+    struct audio_stream *stream = impl_from_IAMMediaStream(iface);
 
-    TRACE("(%p/%p)->(%p)\n", This, iface, multi_media_stream);
+    TRACE("stream %p, mmstream %p.\n", stream, mmstream);
 
-    if (!multi_media_stream)
+    if (!mmstream)
         return E_POINTER;
 
-    IMultiMediaStream_AddRef(This->parent);
-    *multi_media_stream = This->parent;
-
+    if (stream->parent)
+        IMultiMediaStream_AddRef(stream->parent);
+    *mmstream = stream->parent;
     return S_OK;
 }
 
diff --git a/dlls/amstream/ddrawstream.c b/dlls/amstream/ddrawstream.c
index 48ccc52d47c..671585f5d63 100644
--- a/dlls/amstream/ddrawstream.c
+++ b/dlls/amstream/ddrawstream.c
@@ -127,18 +127,18 @@ static ULONG WINAPI ddraw_IAMMediaStream_Release(IAMMediaStream *iface)
 
 /*** IMediaStream methods ***/
 static HRESULT WINAPI ddraw_IAMMediaStream_GetMultiMediaStream(IAMMediaStream *iface,
-        IMultiMediaStream** multi_media_stream)
+        IMultiMediaStream **mmstream)
 {
-    struct ddraw_stream *This = impl_from_IAMMediaStream(iface);
+    struct ddraw_stream *stream = impl_from_IAMMediaStream(iface);
 
-    TRACE("(%p/%p)->(%p)\n", This, iface, multi_media_stream);
+    TRACE("stream %p, mmstream %p.\n", stream, mmstream);
 
-    if (!multi_media_stream)
+    if (!mmstream)
         return E_POINTER;
 
-    IMultiMediaStream_AddRef(This->parent);
-    *multi_media_stream = This->parent;
-
+    if (stream->parent)
+        IMultiMediaStream_AddRef(stream->parent);
+    *mmstream = stream->parent;
     return S_OK;
 }