From 4af33ec41801b9834fbe6772f9c1e53c48e0cd0d Mon Sep 17 00:00:00 2001
From: Niklas Haas <git@haasn.dev>
Date: Fri, 6 Mar 2026 00:50:53 +0100
Subject: [PATCH] swscale/graph: ensure intermediate buffers have extra line
 padding

This basically guarantees that optimized packed routines have enough
space to write a few bytes past the end of the line.

Signed-off-by: Niklas Haas <git@haasn.dev>
---
 libswscale/graph.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libswscale/graph.c b/libswscale/graph.c
index 4363862d1e..978be35203 100644
--- a/libswscale/graph.c
+++ b/libswscale/graph.c
@@ -63,7 +63,7 @@ static int frame_alloc_planes(AVFrame *dst)
         return ret;
 
     const int align = av_cpu_max_align();
-    const int aligned_w = FFALIGN(dst->width, align);
+    const int aligned_w = FFALIGN(dst->width + 1, align); /* add space for over-write */
     ret = av_image_fill_linesizes(dst->linesize, dst->format, aligned_w);
     if (ret < 0)
         return ret;