linux-kernel - Re: [PATCH] net: sched: integer overflow fix

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Message-ID: <1356135095.21834.8106.camel@edumazet-glaptop>
Date:	Fri, 21 Dec 2012 16:11:35 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stefan Hasko <hasko.stevo@...il.com>
Cc:	Jamal Hadi Salim <jhs@...atatu.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Vimalkumar <j.vimal@...il.com>
Subject: Re: [PATCH] net: sched: integer overflow fix

On Fri, 2012-12-21 at 14:51 -0800, Eric Dumazet wrote:
> On Fri, 2012-12-21 at 21:39 +0100, Stefan Hasko wrote:
> > Fixed integer overflow in function htb_dequeue
> > 
> > Signed-off-by: Stefan Hasko <hasko.stevo@...il.com>
> > ---
> >  net/sched/sch_htb.c |    2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
> > index d2922c0..1bd3faa 100644
> > --- a/net/sched/sch_htb.c
> > +++ b/net/sched/sch_htb.c
> > @@ -919,7 +919,7 @@ ok:
> >  	q->now = ktime_to_ns(ktime_get());
> >  	start_at = jiffies;
> >  
> > -	next_event = q->now + 5 * NSEC_PER_SEC;
> > +	next_event = q->now + (u32)5 * NSEC_PER_SEC;
> >  
> >  	for (level = 0; level < TC_HTB_MAXDEPTH; level++) {
> >  		/* common case optimization - skip event handler quickly */
> 
> But this patch is wrong !
> 

Please resend your patch using something like

It will work much better.

diff --git a/net/sched/sch_htb.c b/net/sched/sch_htb.c
index d2922c0..51561ea 100644
--- a/net/sched/sch_htb.c
+++ b/net/sched/sch_htb.c
@@ -919,7 +919,7 @@ ok:
 	q->now = ktime_to_ns(ktime_get());
 	start_at = jiffies;
 
-	next_event = q->now + 5 * NSEC_PER_SEC;
+	next_event = q->now + 5LLU * NSEC_PER_SEC;
 
 	for (level = 0; level < TC_HTB_MAXDEPTH; level++) {
 		/* common case optimization - skip event handler quickly */


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