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

[Andreas Rheinhardt]

ffmpeg | branch: release/4.2 | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Sun Jun 14 03:27:11 2020 +0200| [8bfc38893b37a167d1f668c90f5a0741122b5ff3] | committer: Andreas Rheinhardt

avformat/subviewerdec: 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 a708f652737eba08607df84394ca4bec6b458736)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=8bfc38893b37a167d1f668c90f5a0741122b5ff3
---

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

diff --git a/libavformat/subviewerdec.c b/libavformat/subviewerdec.c
index 06b827b70f..25fe7ac9a6 100644
--- a/libavformat/subviewerdec.c
+++ b/libavformat/subviewerdec.c
@@ -162,6 +162,8 @@ static int subviewer_read_header(AVFormatContext *s)
     ff_subtitles_queue_finalize(s, &subviewer->q);
 
 end:
+    if (res < 0)
+        ff_subtitles_queue_clean(&subviewer->q);
     av_bprint_finalize(&header, NULL);
     return res;
 }