[src/trunk]: src/sys/kern avoid integer overflow during computation of nbuf. ...

[itojun <itojun%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/1b687e8037ed
branches:  trunk
changeset: 535526:1b687e8037ed
user:      itojun <itojun%NetBSD.org@localhost>
date:      Wed Aug 21 02:48:54 2002 +0000

description:
avoid integer overflow during computation of nbuf.  from enami

diffstat:

 sys/kern/kern_allocsys.c |  7 +++----
 1 files changed, 3 insertions(+), 4 deletions(-)

diffs (35 lines):

diff -r c79301437576 -r 1b687e8037ed sys/kern/kern_allocsys.c
--- a/sys/kern/kern_allocsys.c  Wed Aug 21 01:27:58 2002 +0000
+++ b/sys/kern/kern_allocsys.c  Wed Aug 21 02:48:54 2002 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: kern_allocsys.c,v 1.18 2001/11/12 15:25:05 lukem Exp $ */
+/*     $NetBSD: kern_allocsys.c,v 1.19 2002/08/21 02:48:54 itojun Exp $        */
 
 /*-
  * Copyright (c) 1999 The NetBSD Foundation, Inc.
@@ -71,7 +71,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: kern_allocsys.c,v 1.18 2001/11/12 15:25:05 lukem Exp $");
+__KERNEL_RCSID(0, "$NetBSD: kern_allocsys.c,v 1.19 2002/08/21 02:48:54 itojun Exp $");
 
 #include "opt_bufcache.h"
 #include "opt_callout.h"
@@ -171,7 +171,6 @@
                                panic("bufcache is out of range (%d)\n",
                                    bufcache);
                        bufpages = physmem / 100 * bufcache;
-
                } else {
                        if (physmem < btoc(2 * 1024 * 1024))
                                bufpages = physmem / 10;
@@ -206,7 +205,7 @@
         * XXX stopgap measure to prevent wasting too much KVM on
         * the sparsely filled buffer cache.
         */
-       if (nbuf * MAXBSIZE > VM_MAX_KERNEL_BUF)
+       if (nbuf > VM_MAX_KERNEL_BUF / MAXBSIZE)
                nbuf = VM_MAX_KERNEL_BUF / MAXBSIZE;
 #endif