Fixes segfaults with -debug +nomc -flags +gray (presuming
a build with --enable-gray).
Signed-off-by: Andreas Rheinhardt <andreas.rheinha...@outlook.com>
---
libavcodec/mpegvideo_dec.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/libavcodec/mpegvideo_dec.c b/libavcodec/mpegvideo_dec.c
index 7aa46a4e25..77d90104f6 100644
--- a/libavcodec/mpegvideo_dec.c
+++ b/libavcodec/mpegvideo_dec.c
@@ -249,10 +249,12 @@ static void gray_frame(AVFrame *frame)
{
int h_chroma_shift, v_chroma_shift;
- av_pix_fmt_get_chroma_sub_sample(frame->format, &h_chroma_shift,
&v_chroma_shift);
-
for (int i = 0; i < frame->height; i++)
memset(frame->data[0] + frame->linesize[0] * i, 0x80, frame->width);
+
+ if (!frame->data[1])
+ return;
+ av_pix_fmt_get_chroma_sub_sample(frame->format, &h_chroma_shift,
&v_chroma_shift);
for (int i = 0; i < AV_CEIL_RSHIFT(frame->height, v_chroma_shift); i++) {
memset(frame->data[1] + frame->linesize[1] * i,
0x80, AV_CEIL_RSHIFT(frame->width, h_chroma_shift));
--
2.34.1
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