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avcodec/hevc_sei: check size before using it

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Signed-off-by: Limin Wang <lance.lmwang@gmail.com>
This commit is contained in:
Limin Wang 2021-09-09 19:03:54 +08:00
parent 9a7fe439d9
commit 45b850f9f5
1 changed files with 25 additions and 6 deletions
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31
libavcodec/hevc_sei.c
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@ -52,9 +52,13 @@ static int decode_nal_sei_decoded_picture_hash(HEVCSEIPictureHash *s, GetBitCont
return 0;
}
static int decode_nal_sei_mastering_display_info(HEVCSEIMasteringDisplay *s, GetBitContext *gb)
static int decode_nal_sei_mastering_display_info(HEVCSEIMasteringDisplay *s, GetBitContext *gb, int size)
{
int i;
if (size < 24)
return AVERROR_INVALIDDATA;
// Mastering primaries
for (i = 0; i < 3; i++) {
s->display_primaries[i][0] = get_bits(gb, 16);
@ -67,23 +71,32 @@ static int decode_nal_sei_mastering_display_info(HEVCSEIMasteringDisplay *s, Get
// Max and min luminance of mastering display
s->max_luminance = get_bits_long(gb, 32);
s->min_luminance = get_bits_long(gb, 32);
size -= 24;
// As this SEI message comes before the first frame that references it,
// initialize the flag to 2 and decrement on IRAP access unit so it
// persists for the coded video sequence (e.g., between two IRAPs)
s->present = 2;
skip_bits_long(gb, 8 * size);
return 0;
}
static int decode_nal_sei_content_light_info(HEVCSEIContentLight *s, GetBitContext *gb)
static int decode_nal_sei_content_light_info(HEVCSEIContentLight *s, GetBitContext *gb, int size)
{
if (size < 4)
return AVERROR_INVALIDDATA;
// Max and average light levels
s->max_content_light_level = get_bits(gb, 16);
s->max_pic_average_light_level = get_bits(gb, 16);
size -= 4;
// As this SEI message comes before the first frame that references it,
// initialize the flag to 2 and decrement on IRAP access unit so it
// persists for the coded video sequence (e.g., between two IRAPs)
s->present = 2;
skip_bits_long(gb, 8 * size);
return 0;
}
@ -342,10 +355,16 @@ static int decode_nal_sei_active_parameter_sets(HEVCSEI *s, GetBitContext *gb, v
return 0;
}
static int decode_nal_sei_alternative_transfer(HEVCSEIAlternativeTransfer *s, GetBitContext *gb)
static int decode_nal_sei_alternative_transfer(HEVCSEIAlternativeTransfer *s, GetBitContext *gb, int size)
{
if (size < 1)
return AVERROR_INVALIDDATA;
s->present = 1;
s->preferred_transfer_characteristics = get_bits(gb, 8);
size--;
skip_bits_long(gb, 8 * size);
return 0;
}
@ -451,9 +470,9 @@ static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s,
case SEI_TYPE_PIC_TIMING:
return decode_nal_sei_pic_timing(s, gb, ps, logctx, size);
case SEI_TYPE_MASTERING_DISPLAY_COLOUR_VOLUME:
return decode_nal_sei_mastering_display_info(&s->mastering_display, gb);
return decode_nal_sei_mastering_display_info(&s->mastering_display, gb, size);
case SEI_TYPE_CONTENT_LIGHT_LEVEL_INFO:
return decode_nal_sei_content_light_info(&s->content_light, gb);
return decode_nal_sei_content_light_info(&s->content_light, gb, size);
case SEI_TYPE_ACTIVE_PARAMETER_SETS:
return decode_nal_sei_active_parameter_sets(s, gb, logctx);
case SEI_TYPE_USER_DATA_REGISTERED_ITU_T_T35:
@ -461,7 +480,7 @@ static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s,
case SEI_TYPE_USER_DATA_UNREGISTERED:
return decode_nal_sei_user_data_unregistered(&s->unregistered, gb, size);
case SEI_TYPE_ALTERNATIVE_TRANSFER_CHARACTERISTICS:
return decode_nal_sei_alternative_transfer(&s->alternative_transfer, gb);
return decode_nal_sei_alternative_transfer(&s->alternative_transfer, gb, size);
case SEI_TYPE_TIME_CODE:
return decode_nal_sei_timecode(&s->timecode, gb);
case SEI_TYPE_FILM_GRAIN_CHARACTERISTICS: