netdev - Re: [PKT_SCHED] act_gact: division by zero

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Date:	Thu, 30 Nov 2006 15:51:04 +0200 (EET)
From:	"Nordlund Kim (Nokia-NET/Helsinki)" <Kim.Nordlund@...ia.com>
To:	ext Patrick McHardy <kaber@...sh.net>
cc:	"Nordlund Kim (Nokia-NET/Helsinki)" <Kim.Nordlund@...ia.com>,
	<davem@...emloft.net>, <netdev@...r.kernel.org>
Subject: Re: [PKT_SCHED] act_gact: division by zero


On Thu, 30 Nov 2006, ext Patrick McHardy wrote:
> I think it should reject an invalid configuration or handle
> the zero case correctly by not dividing.

You are correct. Not returning -EINVAL, because someone might
want to use the value zero in some future gact_prob algorithm?

Signed-off-by: Kim Nordlund <kim.nordlund@...ia.com>

diff -rub linux-2.6.19-orig/net/sched/act_gact.c linux/net/sched/act_gact.c
--- linux-2.6.19-orig/net/sched/act_gact.c	2006-11-29 23:57:37.000000000 +0200
+++ linux/net/sched/act_gact.c	2006-11-30 15:33:12.000000000 +0200
@@ -48,14 +48,14 @@
 #ifdef CONFIG_GACT_PROB
 static int gact_net_rand(struct tcf_gact *gact)
 {
-	if (net_random() % gact->tcfg_pval)
+	if (!gact->tcfg_pval || net_random() % gact->tcfg_pval)
 		return gact->tcf_action;
 	return gact->tcfg_paction;
 }
 
 static int gact_determ(struct tcf_gact *gact)
 {
-	if (gact->tcf_bstats.packets % gact->tcfg_pval)
+	if (!gact->tcfg_pval || gact->tcf_bstats.packets % gact->tcfg_pval)
 		return gact->tcf_action;
 	return gact->tcfg_paction;
 }

-
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