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shorten: Prevent block size from increasing 

Signed-off-by: Janne Grunau <janne-libav@jannau.net>
This commit is contained in:
Laurent Aimar 2011-10-02 00:48:12 +00:00 committed by Janne Grunau
parent 124a16f678
commit 95010d18b2
1 changed files with 8 additions and 2 deletions
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10
libavcodec/shorten.c
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@ -482,9 +482,15 @@ static int shorten_decode_frame(AVCodecContext *avctx,
case FN_BITSHIFT: case FN_BITSHIFT:
s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE); s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
break; break;
case FN_BLOCKSIZE: case FN_BLOCKSIZE: {
s->blocksize = get_uint(s, av_log2(s->blocksize)); int blocksize = get_uint(s, av_log2(s->blocksize));
if (blocksize > s->blocksize) {
av_log(avctx, AV_LOG_ERROR, "Increasing block size is not supported\n");
return AVERROR_PATCHWELCOME;
}
s->blocksize = blocksize;
break; break;
}
case FN_QUIT: case FN_QUIT:
*data_size = 0; *data_size = 0;
return buf_size; return buf_size;