prevent overflow in a diagnostic check; art@ ok

diff --git a/sys/kern/subr_extent.c b/sys/kern/subr_extent.c
index 33e7789..592a0ff 100644 (file)
--- a/sys/kern/subr_extent.c
+++ b/sys/kern/subr_extent.c
@@ -1,4 +1,4 @@
-/*     $OpenBSD: subr_extent.c,v 1.8 2000/02/15 16:30:28 art Exp $     */
+/*     $OpenBSD: subr_extent.c,v 1.9 2000/03/15 15:58:40 mickey Exp $  */
 /*     $NetBSD: subr_extent.c,v 1.7 1996/11/21 18:46:34 cgd Exp $      */
 
 /*-
@@ -531,7 +531,7 @@ extent_alloc_subregion1(ex, substart, subend, size, alignment, skew, boundary,
                    substart, subend);
                panic("extent_alloc_subregion: bad subregion");
        }
-       if ((size < 1) || (size > ((subend - substart) + 1))) {
+       if (size < 1 || (size - 1) > (subend - substart)) {
                printf("extent_alloc_subregion: extent `%s', size 0x%lx\n",
                    ex->ex_name, size);
                panic("extent_alloc_subregion: bad size");