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avformat/mpegtsenc: Check data array size in mpegts_write_pmt()

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Prevents out of array writes

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-02-13 13:59:51 +01:00
parent af786236cc
commit 842b6c14bc
1 changed files with 8 additions and 3 deletions
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11
libavformat/mpegtsenc.c
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@ -259,7 +259,7 @@ static void mpegts_write_pat(AVFormatContext *s)
data, q - data);
}
static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
static int mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
{
MpegTSWrite *ts = s->priv_data;
uint8_t data[1012], *q, *desc_length_ptr, *program_info_length_ptr;
@ -315,6 +315,10 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
stream_type = STREAM_TYPE_PRIVATE_DATA;
break;
}
if (q - data > sizeof(data) - 32)
return AVERROR(EINVAL);
*q++ = stream_type;
put16(&q, 0xe000 | ts_st->pid);
desc_length_ptr = q;
@ -346,7 +350,7 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
len_ptr = q++;
*len_ptr = 0;
for (p = lang->value; next && *len_ptr < 255 / 4 * 4; p = next + 1) {
for (p = lang->value; next && *len_ptr < 255 / 4 * 4 && q - data < sizeof(data) - 4; p = next + 1) {
next = strchr(p, ',');
if (strlen(p) != 3 && (!next || next != p + 3))
continue; /* not a 3-letter code */
@ -422,7 +426,7 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
*q++ = 0x56;
len_ptr = q++;
while (strlen(language) >= 3) {
while (strlen(language) >= 3 && q - data < sizeof(data) - 6) {
*q++ = *language++;
*q++ = *language++;
*q++ = *language++;
@ -476,6 +480,7 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service)
}
mpegts_write_section1(&service->pmt, PMT_TID, service->sid, ts->tables_version, 0, 0,
data, q - data);
return 0;
}
/* NOTE: str == NULL is accepted for an empty string */