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h265parser: Fix num_long_term_pics bound check

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As defined in the spec 7.4.7.1, calculates allowed maximum
value of num_long_term_pics

Fixes ZDI-CAN-26596

Fixes: https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/4285
Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/8884>
This commit is contained in:
Seungha Yang 2025-03-15 23:48:52 +09:00 committed by GStreamer Marge Bot
parent b33ba2f264
commit d0e18d6353
1 changed files with 36 additions and 2 deletions
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38
subprojects/gst-plugins-bad/gst-libs/gst/codecparsers/gsth265parser.c
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@ -2807,6 +2807,8 @@ gst_h265_parser_parse_slice_hdr (GstH265Parser * parser,
READ_UINT8 (&nr, slice->colour_plane_id, 2);
if (!GST_H265_IS_NAL_TYPE_IDR (nalu->type)) {
const GstH265ShortTermRefPicSet *ref_pic_sets = NULL;
READ_UINT16 (&nr, slice->pic_order_cnt_lsb,
(sps->log2_max_pic_order_cnt_lsb_minus4 + 4));
@ -2823,24 +2825,56 @@ gst_h265_parser_parse_slice_hdr (GstH265Parser * parser,
slice->short_term_ref_pic_set_size =
(nal_reader_get_pos (&nr) - pos) -
(8 * (nal_reader_get_epb_count (&nr) - epb_pos));
ref_pic_sets = &slice->short_term_ref_pic_sets;
} else if (sps->num_short_term_ref_pic_sets > 1) {
/* 7.4.7.1 short_term_ref_pic_set_idx */
const guint n = gst_util_ceil_log2 (sps->num_short_term_ref_pic_sets);
READ_UINT8 (&nr, slice->short_term_ref_pic_set_idx, n);
CHECK_ALLOWED_MAX (slice->short_term_ref_pic_set_idx,
sps->num_short_term_ref_pic_sets - 1);
ref_pic_sets =
&sps->short_term_ref_pic_set[slice->short_term_ref_pic_set_idx];
} else {
ref_pic_sets = &sps->short_term_ref_pic_set[0];
}
if (sps->long_term_ref_pics_present_flag) {
guint32 limit;
guint pos = nal_reader_get_pos (&nr);
guint epb_pos = nal_reader_get_epb_count (&nr);
gint max_num_long_term_pics = 0;
gint TwoVersionsOfCurrDecPicFlag = 0;
if (sps->num_long_term_ref_pics_sps > 0)
if (sps->num_long_term_ref_pics_sps > 0) {
READ_UE_MAX (&nr, slice->num_long_term_sps,
sps->num_long_term_ref_pics_sps);
}
READ_UE_MAX (&nr, slice->num_long_term_pics, 16);
/* 7.4.3.3.3 */
if (pps->pps_scc_extension_flag &&
pps->pps_scc_extension_params.pps_curr_pic_ref_enabled_flag &&
(sps->sample_adaptive_offset_enabled_flag ||
!pps->deblocking_filter_disabled_flag ||
pps->deblocking_filter_override_enabled_flag)) {
TwoVersionsOfCurrDecPicFlag = 1;
}
/* Calculated upper bound num_long_term_pics can have. 7.4.7.1 */
max_num_long_term_pics =
/* sps_max_dec_pic_buffering_minus1[TemporalId], allowed max is
* MaxDpbSize - 1 */
MAX_DPB_SIZE - 1
- (gint) slice->num_long_term_sps
- (gint) ref_pic_sets->NumNegativePics
- (gint) ref_pic_sets->NumPositivePics -
TwoVersionsOfCurrDecPicFlag;
if (max_num_long_term_pics < 0) {
GST_WARNING ("Invalid stream, too many reference pictures");
goto error;
}
READ_UE_MAX (&nr, slice->num_long_term_pics, max_num_long_term_pics);
limit = slice->num_long_term_sps + slice->num_long_term_pics;
for (i = 0; i < limit; i++) {
if (i < slice->num_long_term_sps) {