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avoid integer overflow during computation of nbuf. from enami

This commit is contained in:
itojun 2002-08-21 02:48:54 +00:00
parent c0d823519c
commit fcfced244e
1 changed files with 3 additions and 4 deletions
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7
sys/kern/kern_allocsys.c
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@ -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 @@ allocsys(caddr_t v, caddr_t (*mdcallback)(caddr_t))
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 @@ allocsys(caddr_t v, caddr_t (*mdcallback)(caddr_t))
* 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