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avformat/hevc: Check num_long_term_ref_pics_sps to avoid potentially long loops 

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit ee155c18a2)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-08-24 13:04:38 +02:00
parent cc39b2be23
commit b06958917c
1 changed files with 2 additions and 0 deletions
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2
libavformat/hevc.c
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@ -566,6 +566,8 @@ static int hvcc_parse_sps(GetBitContext *gb,
if (get_bits1(gb)) { // long_term_ref_pics_present_flag
unsigned num_long_term_ref_pics_sps = get_ue_golomb_long(gb);
if (num_long_term_ref_pics_sps > 31U)
return AVERROR_INVALIDDATA;
for (i = 0; i < num_long_term_ref_pics_sps; i++) { // num_long_term_ref_pics_sps
int len = FFMIN(log2_max_pic_order_cnt_lsb_minus4 + 4, 16);
skip_bits (gb, len); // lt_ref_pic_poc_lsb_sps[i]