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avcodec/opus_parser: Check payload_len in parse_opus_ts_header()

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Fixes: clusterfuzz-testcase-minimized-6134545979277312
Fixes: crbug 797469

Reported-by: Matt Wolenetz <wolenetz@google.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2018-01-05 22:12:07 +01:00
parent b3192c64b5
commit 1bcd7fefcb
1 changed files with 13 additions and 3 deletions
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16
libavcodec/opus_parser.c
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@ -43,6 +43,7 @@ static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_le
const uint8_t *buf = start + 1;
int start_trim_flag, end_trim_flag, control_extension_flag, control_extension_length;
uint8_t flags;
uint64_t payload_len_tmp;
GetByteContext gb;
bytestream2_init(&gb, buf, buf_len);
@ -52,11 +53,11 @@ static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_le
end_trim_flag = (flags >> 3) & 1;
control_extension_flag = (flags >> 2) & 1;
*payload_len = 0;
payload_len_tmp = *payload_len = 0;
while (bytestream2_peek_byte(&gb) == 0xff)
*payload_len += bytestream2_get_byte(&gb);
payload_len_tmp += bytestream2_get_byte(&gb);
*payload_len += bytestream2_get_byte(&gb);
payload_len_tmp += bytestream2_get_byte(&gb);
if (start_trim_flag)
bytestream2_skip(&gb, 2);
@ -67,6 +68,11 @@ static const uint8_t *parse_opus_ts_header(const uint8_t *start, int *payload_le
bytestream2_skip(&gb, control_extension_length);
}
if (bytestream2_tell(&gb) + payload_len_tmp > buf_len)
return NULL;
*payload_len = payload_len_tmp;
return buf + bytestream2_tell(&gb);
}
@ -104,6 +110,10 @@ static int opus_find_frame_end(AVCodecParserContext *ctx, AVCodecContext *avctx,
state = (state << 8) | payload[i];
if ((state & OPUS_TS_MASK) == OPUS_TS_HEADER) {
payload = parse_opus_ts_header(payload, &payload_len, buf_size - i);
if (!payload) {
av_log(avctx, AV_LOG_ERROR, "Error parsing Ogg TS header.\n");
return AVERROR_INVALIDDATA;
}
*header_len = payload - buf;
start_found = 1;
break;