[v2] winegstreamer: Avoid zero division in amt_from_gst_caps_video().

[Masanori Kakura]

Fixes https://bugs.winehq.org/show_bug.cgi?id=42212

v2: Use MulDiv() to check integer overflow. (thanks Andrew Eikum)

Signed-off-by: Masanori Kakura <kakurasan at gmail.com>
---
 dlls/winegstreamer/gstdemux.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/dlls/winegstreamer/gstdemux.c b/dlls/winegstreamer/gstdemux.c
index c33ed9e..759a5db 100644
--- a/dlls/winegstreamer/gstdemux.c
+++ b/dlls/winegstreamer/gstdemux.c
@@ -233,9 +233,8 @@ static gboolean amt_from_gst_caps_video(GstCaps *caps, AM_MEDIA_TYPE *amt)
         bih->biCompression = amt->subtype.Data1;
     }
     bih->biSizeImage = width * height * bih->biBitCount / 8;
-    vih->AvgTimePerFrame = 10000000;
-    vih->AvgTimePerFrame *= denom;
-    vih->AvgTimePerFrame /= nom;
+    if ((vih->AvgTimePerFrame = (REFERENCE_TIME)MulDiv(10000000, denom, nom)) == -1)
+        vih->AvgTimePerFrame = 0; /* zero division or integer overflow */
     vih->rcSource.left = 0;
     vih->rcSource.right = width;
     vih->rcSource.top = height;
-- 
2.9.3