h263: fix zygo debug printing overreading.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
13 years ago · e93d911e48
parent d964db5742
commit e93d911e48
1 changed files with 1 additions and 1 deletions
--- a/libavcodec/ituh263dec.c
+++ b/libavcodec/ituh263dec.c
@ -1114,7 +1114,7 @@ int ff_h263_decode_picture_header(MpegEncContext *s)
    }

        ff_h263_show_pict_info(s);
-    if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO")){
+    if (s->pict_type == AV_PICTURE_TYPE_I && s->codec_tag == AV_RL32("ZYGO") && get_bits_left(&s->gb) >= 85 + 13*3*16 + 50){
        int i,j;
        for(i=0; i<85; i++) av_log(s->avctx, AV_LOG_DEBUG, "%d", get_bits1(&s->gb));
        av_log(s->avctx, AV_LOG_DEBUG, "\n");