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Check that cpb_count is within the allowed range. 

Originally committed as revision 16010 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2008-12-05 21:44:18 +00:00
parent 62d6f73edc
commit d23b28c78b
1 changed files with 12 additions and 3 deletions
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15
libavcodec/h264.c
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@ -6834,10 +6834,16 @@ static int decode_sei(H264Context *h){
return 0;
}
static inline void decode_hrd_parameters(H264Context *h, SPS *sps){
static inline int decode_hrd_parameters(H264Context *h, SPS *sps){
MpegEncContext * const s = &h->s;
int cpb_count, i;
cpb_count = get_ue_golomb(&s->gb) + 1;
if(cpb_count > 32U){
av_log(h->s.avctx, AV_LOG_ERROR, "cpb_count %d invalid\n", cpb_count);
return -1;
}
get_bits(&s->gb, 4); /* bit_rate_scale */
get_bits(&s->gb, 4); /* cpb_size_scale */
for(i=0; i<cpb_count; i++){
@ -6849,6 +6855,7 @@ static inline void decode_hrd_parameters(H264Context *h, SPS *sps){
sps->cpb_removal_delay_length = get_bits(&s->gb, 5) + 1;
sps->dpb_output_delay_length = get_bits(&s->gb, 5) + 1;
sps->time_offset_length = get_bits(&s->gb, 5);
return 0;
}
static inline int decode_vui_parameters(H264Context *h, SPS *sps){
@ -6903,10 +6910,12 @@ static inline int decode_vui_parameters(H264Context *h, SPS *sps){
sps->nal_hrd_parameters_present_flag = get_bits1(&s->gb);
if(sps->nal_hrd_parameters_present_flag)
decode_hrd_parameters(h, sps);
if(decode_hrd_parameters(h, sps) < 0)
return -1;
sps->vcl_hrd_parameters_present_flag = get_bits1(&s->gb);
if(sps->vcl_hrd_parameters_present_flag)
decode_hrd_parameters(h, sps);
if(decode_hrd_parameters(h, sps) < 0)
return -1;
if(sps->nal_hrd_parameters_present_flag || sps->vcl_hrd_parameters_present_flag)
get_bits1(&s->gb); /* low_delay_hrd_flag */
sps->pic_struct_present_flag = get_bits1(&s->gb);