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lavfi/alphaextract: fix assignment of invalid size value to memcpy in case linesize < 0 

Fix crash, for example in the command:
ffmpeg -f image2 -vcodec pgmyuv -i tests/vsynth1/%02d.pgm \
  -vf "[in]format=yuv420p,split,alphamerge,split[o3][o4];
       [o4]vflip,alphaextract[alpha];[o3][alpha]alphamerge[out]" \
  -vcodec rawvideo -f nut md5:
This commit is contained in:
Stefano Sabatini 2012-12-07 18:51:33 +01:00
parent c3ad91a3d7
commit 130c6497d2
1 changed files with 1 additions and 1 deletions
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2
libavfilter/vf_alphaextract.c
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@ -87,7 +87,7 @@ static int filter_frame(AVFilterLink *inlink, AVFilterBufferRef *cur_buf)
}
}
} else {
const int linesize = FFMIN(out_buf->linesize[Y], cur_buf->linesize[A]);
const int linesize = abs(FFMIN(out_buf->linesize[Y], cur_buf->linesize[A]));
int y;
for (y = 0; y < out_buf->video->h; y++) {
memcpy(out_buf->data[Y] + y * out_buf->linesize[Y],