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shorten: Prevent block size from increasing

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Signed-off-by: Janne Grunau <janne-libav@jannau.net>
(cherry picked from commit 95010d18b2d808db9a49377e41bc2f7cf4dfa03e)

Signed-off-by: Anton Khirnov <anton@khirnov.net>
(cherry picked from commit 22949c42edf5352c5fa8c43870efe20698432b35)

Signed-off-by: Reinhard Tartler <siretart@tauware.de>
This commit is contained in:
Laurent Aimar 2011-10-02 00:48:12 +00:00 committed by Reinhard Tartler
parent 40cb7b3b49
commit 8f924ee66f
1 changed files with 8 additions and 2 deletions
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10
libavcodec/shorten.c
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@ -486,9 +486,15 @@ static int shorten_decode_frame(AVCodecContext *avctx,
case FN_BITSHIFT:
s->bitshift = get_ur_golomb_shorten(&s->gb, BITSHIFTSIZE);
break;
case FN_BLOCKSIZE:
s->blocksize = get_uint(s, av_log2(s->blocksize));
case FN_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;
}
case FN_QUIT:
*data_size = 0;
return buf_size;