avformat/mpegtsenc: Check data array size in mpegts_write_pmt()
Prevents out of array writes Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -259,7 +259,7 @@ static void mpegts_write_pat(AVFormatContext *s)
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data, q - data);
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}
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static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
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static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
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{
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MpegTSWrite *ts = s->priv_data;
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uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
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@ -315,6 +315,10 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
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stream_type = STREAM_TYPE_PRIVATE_DATA;
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break;
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}
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if (q - data > sizeof(data) - 32)
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return AVERROR(EINVAL);
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*q++ = stream_type;
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put16(&q, 0xe000 | ts_st->pid);
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desc_length_ptr = q;
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@ -346,7 +350,7 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
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len_ptr = q++;
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*len_ptr = 0;
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for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
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for (p = lang->value; next && *len_ptr < 255 / 4 * 4 && q - data < sizeof(data) - 4; p = next + 1) {
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next = strchr(p, ',');
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if (strlen(p) != 3 && (!next || next != p + 3))
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continue; /* not a 3-letter code */
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@ -422,7 +426,7 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
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*q++ = 0x56;
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len_ptr = q++;
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while (strlen(language) >= 3) {
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while (strlen(language) >= 3 && q - data < sizeof(data) - 6) {
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*q++ = *language++;
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*q++ = *language++;
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*q++ = *language++;
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@ -476,6 +480,7 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
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}
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mpegts_write_section1(&service->pmt, PMT_TID, service->sid, ts->tables_version, 0, 0,
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data, q - data);
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return 0;
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}
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/* NOTE: str == NULL is accepted for an empty string */
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