[FFmpeg-cvslog] avcodec/mpegvideo_enc: Dont copy beyond the image

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michael at niedermayer.cc> | Sat Dec 30 03:06:39 2023 +0100| [a066b8a809fa6d8b31398d41787822803f8762f2] | committer: Michael Niedermayer

avcodec/mpegvideo_enc: Dont copy beyond the image

Fixes: out of array access
Fixes: tickets/10754/poc17ffmpeg

Discovered by Zeng Yunxiang.

Signed-off-by: Michael Niedermayer <michael at niedermayer.cc>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=a066b8a809fa6d8b31398d41787822803f8762f2
---

 libavcodec/mpegvideo_enc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavcodec/mpegvideo_enc.c b/libavcodec/mpegvideo_enc.c
index dcbf4c0429..b369c3c735 100644
--- a/libavcodec/mpegvideo_enc.c
+++ b/libavcodec/mpegvideo_enc.c
@@ -1212,7 +1212,7 @@ static int load_input_picture(MpegEncContext *s, const AVFrame *pic_arg)
                     dst += INPLACE_OFFSET;
 
                 if (src_stride == dst_stride)
-                    memcpy(dst, src, src_stride * h);
+                    memcpy(dst, src, src_stride * h - src_stride + w);
                 else {
                     int h2 = h;
                     uint8_t *dst2 = dst;