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| author | Michael Niedermayer <michaelni@gmx.at> | 2014-02-13 13:59:51 +0100 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2014-03-08 15:32:44 +0100 |
| commit | 12770701856a05b6b3cd706f708f8e9a4e8a1336 (patch) | |
| tree | 97081c56ec4e996712dca1b007116c5396c47e1f | |
| parent | c23597ec7eaea16a638729c60866befcd48eda3e (diff) | |
| download | ffmpeg-12770701856a05b6b3cd706f708f8e9a4e8a1336.tar.gz | |
avformat/mpegtsenc: Check data array size in mpegts_write_pmt()
Prevents out of array writes
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit 842b6c14bcfc1c5da1a2d288fd65386eb8c158ad)
Conflicts:
libavformat/mpegtsenc.c
(cherry picked from commit e87de3f50b765134588d0b048c32ed4b8acc16fb)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
| -rw-r--r-- | libavformat/mpegtsenc.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/libavformat/mpegtsenc.c b/libavformat/mpegtsenc.c index 793e2051d4..a12d19fd10 100644 --- a/libavformat/mpegtsenc.c +++ b/libavformat/mpegtsenc.c @@ -240,7 +240,7 @@ 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; @@ -293,6 +293,10 @@ 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; @@ -324,7 +328,7 @@ 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 */ @@ -386,6 +390,7 @@ static void mpegts_write_pmt(AVFormatContext *s, MpegTSService *service) } mpegts_write_section1(&service->pmt, PMT_TID, service->sid, 0, 0, 0, data, q - data); + return 0; } /* NOTE: str == NULL is accepted for an empty string */ |