From 0236fa8b9e87547075d15931c0ac81a86250f862 Mon Sep 17 00:00:00 2001
From: Matthew Waters <matthew@centricular.com>
Date: Mon, 21 Sep 2020 23:50:03 +1000
Subject: [PATCH] compositor: fix YUY2/UYVY/VYUY blending

Don't overead memory.

Fixup for https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/755

Part-of: <https://gitlab.freedesktop.org/gstreamer/gst-plugins-base/-/merge_requests/823>
---
 gst/compositor/blend.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/gst/compositor/blend.c b/gst/compositor/blend.c
index 6eeba1c351..c2c015006e 100644
--- a/gst/compositor/blend.c
+++ b/gst/compositor/blend.c
@@ -969,8 +969,8 @@ blend_##name (GstVideoFrame * srcframe, gint xpos, gint ypos, \
     xpos = 0; \
   } \
   if (ypos < dst_y_start) { \
-    src += -ypos * src_stride; \
-    src_height -= -ypos; \
+    src += (dst_y_start - ypos) * src_stride; \
+    src_height -= dst_y_start - ypos; \
     ypos = dst_y_start; \
   } \
   \