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avcodec/mpegvideo: check that linesize is not too small

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Note linesize is rounded up to at least a multiple of 8

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-06-13 17:12:00 +02:00
parent 4a0ec85b85
commit dffb85a982
1 changed files with 5 additions and 0 deletions
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5
libavcodec/mpegvideo.c
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@ -434,6 +434,11 @@ static int frame_size_alloc(MpegEncContext *s, int linesize)
{
int alloc_size = FFALIGN(FFABS(linesize) + 64, 32);
if (linesize < 24) {
av_log(s->avctx, AV_LOG_ERROR, "Image too small, temporary buffers cannot function\n");
return AVERROR_PATCHWELCOME;
}
// edge emu needs blocksize + filter length - 1
// (= 17x17 for halfpel / 21x21 for h264)
// VC1 computes luma and chroma simultaneously and needs 19X19 + 9x9