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hevc_ps: verify P/T/L information

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This makes the SPS parsing a little, but barely, safer.

Reviewed-by: Mickaël Raulet <mraulet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Christophe Gisquet 2014-08-09 20:11:20 +02:00 committed by Michael Niedermayer
parent 07262c7199
commit 0d0d24af01
1 changed files with 34 additions and 9 deletions
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43
libavcodec/hevc_ps.c
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@ -199,12 +199,15 @@ int ff_hevc_decode_short_term_rps(HEVCContext *s, ShortTermRPS *rps,
}
static void decode_profile_tier_level(HEVCContext *s, PTLCommon *ptl)
static int decode_profile_tier_level(HEVCContext *s, PTLCommon *ptl)
{
int i;
HEVCLocalContext *lc = s->HEVClc;
GetBitContext *gb = &lc->gb;
if (get_bits_left(gb) < 2+1+5 + 32 + 4 + 16 + 16 + 12)
return -1;
ptl->profile_space = get_bits(gb, 2);
ptl->tier_flag = get_bits1(gb);
ptl->profile_idc = get_bits(gb, 5);
@ -229,29 +232,49 @@ static void decode_profile_tier_level(HEVCContext *s, PTLCommon *ptl)
skip_bits(gb, 16); // XXX_reserved_zero_44bits[0..15]
skip_bits(gb, 16); // XXX_reserved_zero_44bits[16..31]
skip_bits(gb, 12); // XXX_reserved_zero_44bits[32..43]
return 0;
}
static void parse_ptl(HEVCContext *s, PTL *ptl, int max_num_sub_layers)
static int parse_ptl(HEVCContext *s, PTL *ptl, int max_num_sub_layers)
{
int i;
HEVCLocalContext *lc = s->HEVClc;
GetBitContext *gb = &lc->gb;
decode_profile_tier_level(s, &ptl->general_ptl);
if (decode_profile_tier_level(s, &ptl->general_ptl) < 0 ||
get_bits_left(gb) < 8 + 8*2) {
av_log(s->avctx, AV_LOG_ERROR, "PTL information too short\n");
return -1;
}
ptl->general_ptl.level_idc = get_bits(gb, 8);
for (i = 0; i < max_num_sub_layers - 1; i++) {
ptl->sub_layer_profile_present_flag[i] = get_bits1(gb);
ptl->sub_layer_level_present_flag[i] = get_bits1(gb);
}
if (max_num_sub_layers - 1> 0)
for (i = max_num_sub_layers - 1; i < 8; i++)
skip_bits(gb, 2); // reserved_zero_2bits[i]
for (i = 0; i < max_num_sub_layers - 1; i++) {
if (ptl->sub_layer_profile_present_flag[i])
decode_profile_tier_level(s, &ptl->sub_layer_ptl[i]);
if (ptl->sub_layer_level_present_flag[i])
ptl->sub_layer_ptl[i].level_idc = get_bits(gb, 8);
if (ptl->sub_layer_profile_present_flag[i] &&
decode_profile_tier_level(s, &ptl->sub_layer_ptl[i]) < 0) {
av_log(s->avctx, AV_LOG_ERROR,
"PTL information for sublayer %i too short\n", i);
return -1;
}
if (ptl->sub_layer_level_present_flag[i]) {
if (get_bits_left(gb) < 8) {
av_log(s->avctx, AV_LOG_ERROR,
"Not enough data for sublayer %i level_idc\n", i);
return -1;
} else
ptl->sub_layer_ptl[i].level_idc = get_bits(gb, 8);
}
}
return 0;
}
static void decode_sublayer_hrd(HEVCContext *s, unsigned int nb_cpb,
@ -375,7 +398,8 @@ int ff_hevc_decode_nal_vps(HEVCContext *s)
goto err;
}
parse_ptl(s, &vps->ptl, vps->vps_max_sub_layers);
if (parse_ptl(s, &vps->ptl, vps->vps_max_sub_layers) < 0)
goto err;
vps->vps_sub_layer_ordering_info_present_flag = get_bits1(gb);
@ -692,7 +716,8 @@ int ff_hevc_decode_nal_sps(HEVCContext *s)
skip_bits1(gb); // temporal_id_nesting_flag
parse_ptl(s, &sps->ptl, sps->max_sub_layers);
if (parse_ptl(s, &sps->ptl, sps->max_sub_layers) < 0)
goto err;
sps_id = get_ue_golomb_long(gb);
if (sps_id >= MAX_SPS_COUNT) {