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h264: More correct ref_count check in decode_slice_header() 

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2011-09-28 22:22:56 +02:00
parent 514c44c4fa
commit dc9ce40069
1 changed files with 6 additions and 5 deletions
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11
libavcodec/h264.c
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@ -2881,6 +2881,7 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
h->ref_count[1]= h->pps.ref_count[1];
if(h->slice_type_nos != AV_PICTURE_TYPE_I){
unsigned max= (16<<(s->picture_structure != PICT_FRAME))-1;
if(h->slice_type_nos == AV_PICTURE_TYPE_B){
h->direct_spatial_mv_pred= get_bits1(&s->gb);
}
@ -2891,11 +2892,11 @@ static int decode_slice_header(H264Context *h, H264Context *h0){
if(h->slice_type_nos==AV_PICTURE_TYPE_B)
h->ref_count[1]= get_ue_golomb(&s->gb) + 1;
if(h->ref_count[0]-1 > 32-1 || h->ref_count[1]-1 > 32-1){
av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow\n");
h->ref_count[0]= h->ref_count[1]= 1;
return -1;
}
}
if(h->ref_count[0]-1 > max || h->ref_count[1]-1 > max){
av_log(h->s.avctx, AV_LOG_ERROR, "reference overflow\n");
h->ref_count[0]= h->ref_count[1]= 1;
return -1;
}
if(h->slice_type_nos == AV_PICTURE_TYPE_B)
h->list_count= 2;