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>

diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 69e0595db9cd9f5ffce457ff4355e1819176e911..60e19ffdedae51804b3a1eff6ce5e3f8bf4c7222 100644 (file)
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -824,6 +824,7 @@ 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;