From 4b9f3c4323d29af0e55222265fc92680c6480aec Mon Sep 17 00:00:00 2001
From: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
Date: Tue, 22 Oct 2019 14:54:09 +0200
Subject: [PATCH] avformat/mpeg: Don't use unintialized value

vobsub_read_packet() didn't check whether an array of AVPackets was
valid and therefore used uninitialized values.

Reviewed-by: Michael Niedermayer <michael@niedermayer.cc>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>
(cherry picked from commit a39536caee6607f481e9075bfb11937f46a47489)
---
 libavformat/mpeg.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libavformat/mpeg.c b/libavformat/mpeg.c
index d10dd45d5b..ff85ad54ee 100644
--- a/libavformat/mpeg.c
+++ b/libavformat/mpeg.c
@@ -915,6 +915,10 @@ static int vobsub_read_packet(AVFormatContext *s, AVPacket *pkt)
         FFDemuxSubtitlesQueue *tmpq = &vobsub->q[i];
         int64_t ts;
         av_assert0(tmpq->nb_subs);
+
+        if (tmpq->current_sub_idx >= tmpq->nb_subs)
+            continue;
+
         ts = tmpq->subs[tmpq->current_sub_idx].pts;
         if (ts < min_ts) {
             min_ts = ts;