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

[Andreas Rheinhardt]

ffmpeg | branch: release/4.0 | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Sun Jun 14 03:24:23 2020 +0200| [688b46d1fa95da1e2cc472df0864f868cb2c0861] | committer: Andreas Rheinhardt

avformat/stldec: 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 e13874b9eae4e156ca1c478e6d59d3461bbdc09f)
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt at gmail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=688b46d1fa95da1e2cc472df0864f868cb2c0861
---

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

diff --git a/libavformat/stldec.c b/libavformat/stldec.c
index 35de49322c..87bf0724a9 100644
--- a/libavformat/stldec.c
+++ b/libavformat/stldec.c
@@ -97,8 +97,10 @@ static int stl_read_header(AVFormatContext *s)
         if (pts_start != AV_NOPTS_VALUE) {
             AVPacket *sub;
             sub = ff_subtitles_queue_insert(&stl->q, p, strlen(p), 0);
-            if (!sub)
+            if (!sub) {
+                ff_subtitles_queue_clean(&stl->q);
                 return AVERROR(ENOMEM);
+            }
             sub->pos = pos;
             sub->pts = pts_start;
             sub->duration = duration;