Fixes null ptr dereference
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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;