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

[Andreas Rheinhardt]

ffmpeg | branch: release/4.3 | Andreas Rheinhardt <andreas.rheinhardt at gmail.com> | Sun Jun 14 03:09:08 2020 +0200| [db2002aee700e477225b82f393b25b3b371f4f64] | committer: Andreas Rheinhardt

avformat/jacosubdec: 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 c13a752733a9af955b032c55f704b748fe37dd19)

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=db2002aee700e477225b82f393b25b3b371f4f64
---

 libavformat/jacosubdec.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/libavformat/jacosubdec.c b/libavformat/jacosubdec.c
index 121c86d659..3414eb3938 100644
--- a/libavformat/jacosubdec.c
+++ b/libavformat/jacosubdec.c
@@ -188,8 +188,10 @@ static int jacosub_read_header(AVFormatContext *s)
             AVPacket *sub;
 
             sub = ff_subtitles_queue_insert(&jacosub->q, line, len, merge_line);
-            if (!sub)
-                return AVERROR(ENOMEM);
+            if (!sub) {
+                ret = AVERROR(ENOMEM);
+                goto fail;
+            }
             sub->pos = pos;
             merge_line = len > 1 && !strcmp(&line[len - 2], "\\\n");
             continue;