avformat/movenc: Free old vos_data before overwriting it

Otherwise the old data leaks whenever extradata needs to be rewritten
(e.g. when encoding FLAC with our encoder that sends an updated
extradata packet at the end).

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@gmail.com>

diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 7256eb2a0fba31e431b82fe087bd1afb64303b24..6ed93d89eaed888ee5de579453059ce4bc6ad910 100644 (file)
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -6983,6 +6983,7 @@ static int mov_write_trailer(AVFormatContext *s)
             AVCodecParameters *par = track->par;
 
             track->vos_len  = par->extradata_size;
+            av_freep(&track->vos_data);
             track->vos_data = av_malloc(track->vos_len + AV_INPUT_BUFFER_PADDING_SIZE);
             if (!track->vos_data)
                 return AVERROR(ENOMEM);