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avformat/ty: do not overread chunk 

Signed-off-by: Paul B Mahol <onemda@gmail.com>
This commit is contained in:
Paul B Mahol 2017-11-06 21:00:08 +01:00
parent cdd19e2c56
commit a29a0aba79
1 changed files with 4 additions and 0 deletions
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4
libavformat/ty.c
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@ -249,7 +249,11 @@ static int analyze_chunk(AVFormatContext *s, const uint8_t *chunk)
* in MPEG packets to determine tivo_type */
if (ty->tivo_type == TIVO_TYPE_UNKNOWN) {
uint32_t data_offset = 16 * num_recs;
for (i = 0; i < num_recs; i++) {
if (data_offset + hdrs[i].rec_size > CHUNK_SIZE)
break;
if ((hdrs[i].subrec_type << 0x08 | hdrs[i].rec_type) == 0x3c0 && hdrs[i].rec_size > 15) {
/* first make sure we're aligned */
int pes_offset = find_es_header(ty_MPEGAudioPacket,