From f38d0d0c22c1871ef0728a718c5e00a6ba93bfa1 Mon Sep 17 00:00:00 2001
From: Paul B Mahol <onemda@gmail.com>
Date: Sun, 12 Nov 2017 22:57:06 +0100
Subject: [PATCH] avformat/ty: check cur_chunk_pos before using it

Fixes #6831.

Signed-off-by: Paul B Mahol <onemda@gmail.com>
---
 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) {