diff --git a/xen/common/llc-coloring.c b/xen/common/llc-coloring.c
index 822a6b2ed5..eb7c72b240 100644
--- a/xen/common/llc-coloring.c
+++ b/xen/common/llc-coloring.c
@@ -76,8 +76,9 @@ static int __init parse_color_config(const char *buf, unsigned int colors[],
         else                /* Single value */
             end = start;
 
-        if ( start > end || (end - start) > (UINT_MAX - *num_colors) ||
-             (*num_colors + (end - start)) >= max_num_colors )
+        if ( end >= NR_LLC_COLORS || start > end ||
+             (end - start) >= (UINT_MAX - *num_colors) ||
+             (*num_colors + (end - start + 1)) >= max_num_colors )
             return -EINVAL;
 
         /* Colors are range checked in check_colors() */