[FFmpeg-cvslog] mpegvideo: clear overread in clear_context

[Andreas Cadhalpun]

ffmpeg | branch: release/2.4 | Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com> | Sat Nov 14 22:46:46 2015 +0100| [ae1156ef2aa36b1b0e61787a52f5e06487bb1056] | committer: Andreas Cadhalpun

mpegvideo: clear overread in clear_context

Otherwise the h263p decoder can try to copy overread bytes, even though
buffer is NULL.

Reviewed-by: Michael Niedermayer <michael at niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>
(cherry picked from commit 6a69a175e7b5c5393528ed0f5753e41573fa0df2)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun at googlemail.com>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=ae1156ef2aa36b1b0e61787a52f5e06487bb1056
---

 libavcodec/mpegvideo.c |    1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index bea62d9..645d757 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1315,6 +1315,7 @@ static void clear_context(MpegEncContext *s)
 
     s->parse_context.buffer = NULL;
     s->parse_context.buffer_size = 0;
+    s->parse_context.overread = 0;
     s->bitstream_buffer = NULL;
     s->allocated_bitstream_buffer_size = 0;
     s->picture          = NULL;