[FFmpeg-cvslog] avcodec/mpegvideo: check that the context is initialized in ff_mpv_common_frame_size_change( )

[Michael Niedermayer]

ffmpeg | branch: release/2.0 | Michael Niedermayer <michaelni at gmx.at> | Sun Sep  7 13:00:47 2014 +0200| [2b415192fd9a60642f87afc602c424df36f8c82c] | committer: Michael Niedermayer

avcodec/mpegvideo: check that the context is initialized in ff_mpv_common_frame_size_change()

The function otherwise would initialize the context without setting context_initialized
alternatively we could set context_initialized

Fixes valgrind anomalies related to ticket 3928

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>
(cherry picked from commit 0d0f7f0ba43f64312ae4a05d97afecf1b7b1330c)

Signed-off-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=2b415192fd9a60642f87afc602c424df36f8c82c
---

 libavcodec/mpegvideo.c |    3 +++
 1 file changed, 3 insertions(+)

diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c
index 666fcca..8091382 100644
--- a/libavcodec/mpegvideo.c
+++ b/libavcodec/mpegvideo.c
@@ -1182,6 +1182,9 @@ int ff_MPV_common_frame_size_change(MpegEncContext *s)
 {
     int i, err = 0;
 
+    if (!s->context_initialized)
+        return AVERROR(EINVAL);
+
     if (s->slice_context_count > 1) {
         for (i = 0; i < s->slice_context_count; i++) {
             free_duplicate_context(s->thread_context[i]);