Commit 9d1764c43 for imagemagick.org

commit 9d1764c43a15b78e18a7f66649989d59079a9e15
Author: Cristy <urban-warrior@imagemagick.org>
Date:   Sun Jun 7 22:05:34 2026 -0400

    https://github.com/ImageMagick/ImageMagick/security/advisories/GHSA-8g53-9m3c-69xg#advisory-comment-224693

diff --git a/coders/png.c b/coders/png.c
index 12a1df349..3dbec1744 100644
--- a/coders/png.c
+++ b/coders/png.c
@@ -6605,7 +6605,7 @@ static Image *ReadOneMNGImage(MngReadInfo* mng_info,
                   }

                 n=GetAuthenticPixels(image,0,0,image->columns,1,exception);
-                (void) memcpy(next,n,length);
+                (void) memcpy(next,n,length*sizeof(*next));

                 for (y=0; y < (ssize_t) image->rows; y++)
                 {
@@ -6631,8 +6631,8 @@ static Image *ReadOneMNGImage(MngReadInfo* mng_info,
                   if (y < (ssize_t) image->rows-1)
                     {
                       n=GetAuthenticPixels(image,0,y+1,image->columns,1,
-                          exception);
-                      (void) memcpy(next,n,length);
+                        exception);
+                      (void) memcpy(next,n,length*sizeof(*next));
                     }

                   for (i=0; i < m; i++, yy++)