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asv1dec: check extradatasize before reading. 

Fixes null ptr dereference

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2012-04-22 12:16:29 +02:00
parent fa5dacce14
commit 605f2b6b00
1 changed files with 1 additions and 2 deletions
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3
libavcodec/asv1.c
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@ -553,8 +553,7 @@ static av_cold int decode_init(AVCodecContext *avctx){
ff_init_scantable(a->dsp.idct_permutation, &a->scantable, scantab);
avctx->pix_fmt= PIX_FMT_YUV420P;
a->inv_qscale= avctx->extradata[0];
if(a->inv_qscale == 0){
if(avctx->extradata_size < 1 || (a->inv_qscale= avctx->extradata[0]) == 0){
av_log(avctx, AV_LOG_ERROR, "illegal qscale 0\n");
if(avctx->codec_id == CODEC_ID_ASV1)
a->inv_qscale= 6;