From: Anton Fedchin <afedc...@ruswizards.com>
after 153b36f there is a possibility to crash when trying to get index of
a surface which points to nirvana. it may occurs when a mpeg2 stream starts
with non i-frame.
---
libavcodec/dxva2_mpeg2.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/libavcodec/dxva2_mpeg2.c b/libavcodec/dxva2_mpeg2.c
index 8cc21bf199..c862e6e5e4 100644
--- a/libavcodec/dxva2_mpeg2.c
+++ b/libavcodec/dxva2_mpeg2.c
@@ -48,11 +48,11 @@ static void fill_picture_parameters(AVCodecContext *avctx,
memset(pp, 0, sizeof(*pp));
pp->wDecodedPictureIndex = ff_dxva2_get_surface_index(avctx, ctx,
current_picture->f);
pp->wDeblockedPictureIndex = 0;
- if (s->pict_type != AV_PICTURE_TYPE_I)
+ if (s->pict_type != AV_PICTURE_TYPE_I && s->last_picture_ptr)
pp->wForwardRefPictureIndex = ff_dxva2_get_surface_index(avctx, ctx,
s->last_picture.f);
else
pp->wForwardRefPictureIndex = 0xffff;
- if (s->pict_type == AV_PICTURE_TYPE_B)
+ if (s->pict_type == AV_PICTURE_TYPE_B && s->next_picture_ptr)
pp->wBackwardRefPictureIndex = ff_dxva2_get_surface_index(avctx, ctx,
s->next_picture.f);
else
pp->wBackwardRefPictureIndex = 0xffff;
--
2.17.1.windows.2
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