From 725d7fb2c608f8f4712fc13750455eec47b0cc4a Mon Sep 17 00:00:00 2001
From: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
Date: Sat, 14 Nov 2015 22:46:46 +0100
Subject: [PATCH] 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@niedermayer.cc>
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
(cherry picked from commit 6a69a175e7b5c5393528ed0f5753e41573fa0df2)
Signed-off-by: Andreas Cadhalpun <Andreas.Cadhalpun@googlemail.com>
---
 libavcodec/mpegvideo.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 06188a03c0..60b9f8a8a7 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1257,6 +1257,7 @@ 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;