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asvdec: Verify the amount of extradata

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The init function reads one byte of extradata.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
Signed-off-by: Martin Storsjö <martin@martin.st>
This commit is contained in:
Martin Storsjö 2013-09-19 15:14:56 +03:00
parent 72fe16a13e
commit f50803354c
1 changed files with 5 additions and 0 deletions
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5
libavcodec/asvdec.c
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@ -274,6 +274,11 @@ static av_cold int decode_init(AVCodecContext *avctx)
const int scale = avctx->codec_id == AV_CODEC_ID_ASV1 ? 1 : 2;
int i;
if (avctx->extradata_size < 1) {
av_log(avctx, AV_LOG_ERROR, "No extradata provided\n");
return AVERROR_INVALIDDATA;
}
ff_asv_common_init(avctx);
init_vlcs(a);
ff_init_scantable(a->dsp.idct_permutation, &a->scantable, ff_asv_scantab);