Commit 0ca86fca3 for imagemagick.org

commit 0ca86fca35915e22e66b4b1f95995d9f5f690f9a
Author: Cristy <urban-warrior@imagemagick.org>
Date:   Tue Jun 30 22:25:57 2026 -0400

    check for overflow

diff --git a/MagickCore/cache.c b/MagickCore/cache.c
index e28372ee9..27e549b06 100644
--- a/MagickCore/cache.c
+++ b/MagickCore/cache.c
@@ -4354,12 +4354,17 @@ MagickPrivate Quantum *QueueAuthenticPixelCacheNexus(Image *image,
     }
   if (IsValidPixelOffset(y,cache_info->columns) == MagickFalse)
     return((Quantum *) NULL);
-  offset=y*(MagickOffsetType) cache_info->columns+x;
+  offset=y*(MagickOffsetType) cache_info->columns;
+  if (IsOffsetOverflow(offset,(MagickOffsetType) x) == MagickFalse)
+    return((Quantum *) NULL);
+  offset+=x;
   if (offset < 0)
     return((Quantum *) NULL);
   number_pixels=(MagickSizeType) cache_info->columns*cache_info->rows;
-  offset+=((MagickOffsetType) rows-1)*(MagickOffsetType) cache_info->columns+
-    (MagickOffsetType) columns-1;
+  offset+=((MagickOffsetType) rows-1)*(MagickOffsetType) cache_info->columns;
+  if (IsOffsetOverflow(offset,(MagickOffsetType) columns-1) == MagickFalse)
+    return((Quantum *) NULL);
+  offset+=(MagickOffsetType) columns-1;
   if ((MagickSizeType) offset >= number_pixels)
     return((Quantum *) NULL);
   /*