[FFmpeg-cvslog] avformat/mpl2dec: Fix memleak upon read header failure

[Andreas Rheinhardt]

ffmpeg | branch: release/3.4 | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Sun Jun 14 03:19:32 2020 +0200| [036c52f2d6b9f42e171b186cf2a038b8684d3f71] | committer: Andreas Rheinhardt

avformat/mpl2dec: Fix memleak upon read header failure

The already parsed subtitles (contained in an FFDemuxSubtitlesQueue)
would leak if an error happened upon reading a subsequent subtitle.

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>
(cherry picked from commit 331799747e7e995710f5dfc4d413cda35eb01289)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=036c52f2d6b9f42e171b186cf2a038b8684d3f71
---

 libavformat/mpl2dec.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/mpl2dec.c b/libavformat/mpl2dec.c
index 0665c4c635..c25f85e0e3 100644
--- a/libavformat/mpl2dec.c
+++ b/libavformat/mpl2dec.c
@@ -111,8 +111,10 @@ static int mpl2_read_header(AVFormatContext *s)
             AVPacket *sub;
 
             sub = ff_subtitles_queue_insert(&mpl2->q, p, strlen(p), 0);
-            if (!sub)
+            if (!sub) {
+                ff_subtitles_queue_clean(&mpl2->q);
                 return AVERROR(ENOMEM);
+            }
             sub->pos = pos;
             sub->pts = pts_start;
             sub->duration = duration;