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>

diff --git a/libavcodec/asv1.c b/libavcodec/asv1.c
index c6e0c53000c40f5a96d4890c0392e2fac33a1797..702a59ee3fd1465972dc0d3df220053948ceb82e 100644 (file)
--- a/libavcodec/asv1.c
+++ b/libavcodec/asv1.c
@@ -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;