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gst-ffmpeg: vp3: Copy all 3 frames for thread updates.

This fixes a double release of the current frame on deinit.
Fixes CVE-2011-3934

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Upstream-Status: Backport

Signed-off-by: Yue.Tao <yue.tao@windriver.com>

---
 libavcodec/vp3.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/libavcodec/vp3.c b/libavcodec/vp3.c
index 738ae9f..b5daafc 100644
--- a/gst-libs/ext/libav/libavcodec/vp3.c
+++ b/gst-libs/ext/libav/libavcodec/vp3.c
@@ -1859,7 +1859,7 @@ static int vp3_update_thread_context(AVCodecContext *dst, const AVCodecContext *
         ||s->width != s1->width
         ||s->height!= s1->height) {
         if (s != s1)
-            copy_fields(s, s1, golden_frame, current_frame);
+            copy_fields(s, s1, golden_frame, keyframe);
         return -1;
     }
 
-- 
1.7.5.4