Fabian Maurer : mfplat: Prevent use after free (Coverity).

[Alexandre Julliard]

Module: wine
Branch: stable
Commit: 5d0795bb4192c92244e88cd54ae604278a6e57b6
URL:    https://gitlab.winehq.org/wine/wine/-/commit/5d0795bb4192c92244e88cd54ae6042...

Author: Fabian Maurer 
Date:   Tue Apr 26 21:03:22 2022 +0200

mfplat: Prevent use after free (Coverity).

Signed-off-by: Fabian Maurer 
Signed-off-by: Nikolay Sivov 
Signed-off-by: Alexandre Julliard 
(cherry picked from commit f5d41f28f6442bd7e074efa17785b40ad3c65ba4)
Signed-off-by: Michael Stefaniuc

---

dlls/mfplat/mediatype.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/dlls/mfplat/mediatype.c b/dlls/mfplat/mediatype.c
index 4f24ccbd237..26295a254b2 100644
--- a/dlls/mfplat/mediatype.c
+++ b/dlls/mfplat/mediatype.c
@@ -978,6 +978,7 @@ static const MFVIDEOFORMAT * WINAPI video_mediatype_GetVideoFormat(IMFVideoMedia
     TRACE("%p.\n", iface);

CoTaskMemFree(media_type->video_format);
+    media_type->video_format = NULL;
     if (FAILED(hr = MFCreateMFVideoFormatFromMFMediaType(&media_type->IMFMediaType_iface, &media_type->video_format, &size)))
         WARN("Failed to create format description, hr %#x.\n", hr);

@@ -1378,6 +1379,7 @@ static const WAVEFORMATEX * WINAPI audio_mediatype_GetAudioFormat(IMFAudioMediaT
     TRACE("%p.\n", iface);

CoTaskMemFree(media_type->audio_format);
+    media_type->audio_format = NULL;
     if (FAILED(hr = MFCreateWaveFormatExFromMFMediaType(&media_type->IMFMediaType_iface, &media_type->audio_format,
             &size, MFWaveFormatExConvertFlag_Normal)))
     {