[FFmpeg-cvslog] lavf/vividas: Do not increase extradata_size after allocation.

[Carl Eugen Hoyos]

ffmpeg | branch: master | Carl Eugen Hoyos <ceffmpeg at gmail.com> | Sun Dec 23 00:34:57 2018 +0100| [17aed996bc35a020416e10075f1e6cc61b6cf805] | committer: Carl Eugen Hoyos

lavf/vividas: Do not increase extradata_size after allocation.

Avoids a crash in avcodec_parameters_from_context().

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=17aed996bc35a020416e10075f1e6cc61b6cf805
---

 libavformat/vividas.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/vividas.c b/libavformat/vividas.c
index e199b05d69..00a1a0f6ef 100644
--- a/libavformat/vividas.c
+++ b/libavformat/vividas.c
@@ -392,7 +392,8 @@ static void track_header(VividasDemuxContext *viv, AVFormatContext *s,  uint8_t
                 offset += data_len[j];
             }
 
-            st->codecpar->extradata_size = offset;
+            if (offset < st->codecpar->extradata_size)
+                st->codecpar->extradata_size = offset;
         }
     }