[FFmpeg-cvslog] avformat/ty: check cur_chunk_pos before using it

[Paul B Mahol]

ffmpeg | branch: master | Paul B Mahol <onemda at gmail.com> | Sun Nov 12 22:57:06 2017 +0100| [f38d0d0c22c1871ef0728a718c5e00a6ba93bfa1] | committer: Paul B Mahol

avformat/ty: check cur_chunk_pos before using it

Fixes #6831.

Signed-off-by: Paul B Mahol <onemda at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=f38d0d0c22c1871ef0728a718c5e00a6ba93bfa1
---

 libavformat/ty.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/libavformat/ty.c b/libavformat/ty.c
index ba874280ea..d348643f40 100644
--- a/libavformat/ty.c
+++ b/libavformat/ty.c
@@ -378,6 +378,8 @@ static void parse_master(AVFormatContext *s)
 
     ty->cur_chunk_pos = 32;
     for (j = 0; j < ty->seq_table_size; j++) {
+        if (ty->cur_chunk_pos >= CHUNK_SIZE - 8)
+            return;
         ty->seq_table[j].timestamp = AV_RB64(ty->chunk + ty->cur_chunk_pos);
         ty->cur_chunk_pos += 8;
         if (map_size > 8) {