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Avoid integer overflow in percent calculation when facing a mbuf leak.

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Fixes PR bin/19381 by Michael van Elst (slightly different than suggested).
This commit is contained in:
martin 2002-12-14 11:12:24 +00:00
parent 16c0ce8d78
commit 304244f5d7
1 changed files with 16 additions and 5 deletions
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21
usr.bin/netstat/mbuf.c
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@ -1,4 +1,4 @@
/* $NetBSD: mbuf.c,v 1.17 2002/03/09 23:26:51 sommerfeld Exp $ */
/* $NetBSD: mbuf.c,v 1.18 2002/12/14 11:12:24 martin Exp $ */
/*
* Copyright (c) 1983, 1988, 1993
@ -38,7 +38,7 @@
#if 0
static char sccsid[] = "from: @(#)mbuf.c 8.1 (Berkeley) 6/6/93";
#else
__RCSID("$NetBSD: mbuf.c,v 1.17 2002/03/09 23:26:51 sommerfeld Exp $");
__RCSID("$NetBSD: mbuf.c,v 1.18 2002/12/14 11:12:24 martin Exp $");
#endif
#endif /* not lint */
@ -52,6 +52,7 @@ __RCSID("$NetBSD: mbuf.c,v 1.17 2002/03/09 23:26:51 sommerfeld Exp $");
#include <stdio.h>
#include <stdlib.h>
#include <limits.h>
#include "netstat.h"
#define YES 1
@ -87,7 +88,8 @@ mbpr(mbaddr, msizeaddr, mclbaddr, mbpooladdr, mclpooladdr)
u_long msizeaddr, mclbaddr;
u_long mbpooladdr, mclpooladdr;
{
int totmem, totused, totmbufs, totpct;
u_long totmem, totused, totpct;
u_int totmbufs;
int i;
struct mbtypes *mp;
@ -157,8 +159,17 @@ mbpr(mbaddr, msizeaddr, mclbaddr, mbpooladdr, mclpooladdr)
(mclpool.pr_npages << mclpa.pa_pageshift);
totused = (mbpool.pr_nget - mbpool.pr_nput) * mbpool.pr_size +
(mclpool.pr_nget - mclpool.pr_nput) * mclpool.pr_size;
totpct = (totmem == 0)? 0 : ((totused * 100)/totmem);
printf("%u Kbytes allocated to network (%d%% in use)\n",
if (totmem == 0)
totpct = 0;
else if (totused < (ULONG_MAX/100))
totpct = (totused * 100)/totmem;
else {
u_long totmem1 = totmem/100;
u_long totused1 = totused/100;
totpct = (totused1 * 100)/totmem1;
}
printf("%lu Kbytes allocated to network (%lu%% in use)\n",
totmem / 1024, totpct);
printf("%lu requests for memory denied\n", mbstat.m_drops);
printf("%lu requests for memory delayed\n", mbstat.m_wait);