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avcodec/hevc_ps: Check num_long_term_ref_pics_sps

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Fixes out of array access
Fixes: signal_sigsegv_35bd0f0_1182_cov_791726764_STRUCT_B_Samsung_4.bit
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit ea38e5a6b75706477898eb1e6582d667dbb9946c)

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-11-28 03:46:56 +01:00
parent 6212758c07
commit 35cfb99c15
1 changed files with 5 additions and 0 deletions
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5
libavcodec/hevc_ps.c
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@ -824,6 +824,11 @@ int ff_hevc_decode_nal_sps(HEVCContext *s)
sps->long_term_ref_pics_present_flag = get_bits1(gb);
if (sps->long_term_ref_pics_present_flag) {
sps->num_long_term_ref_pics_sps = get_ue_golomb_long(gb);
if (sps->num_long_term_ref_pics_sps > 31U) {
av_log(0, AV_LOG_ERROR, "num_long_term_ref_pics_sps %d is out of range.\n",
sps->num_long_term_ref_pics_sps);
goto err;
}
for (i = 0; i < sps->num_long_term_ref_pics_sps; i++) {
sps->lt_ref_pic_poc_lsb_sps[i] = get_bits(gb, sps->log2_max_poc_lsb);
sps->used_by_curr_pic_lt_sps_flag[i] = get_bits1(gb);