linux-kernel - Re: [patch] ntp: avoid integer overflow in do

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Message-Id: <1174827661.10840.514.camel@localhost.localdomain>
Date:	Sun, 25 Mar 2007 15:01:00 +0200
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Roman Zippel <zippel@...ux-m68k.org>,
	john stultz <johnstul@...ibm.com>, linux-kernel@...r.kernel.org
Subject: Re: [patch] ntp: avoid integer overflow in do_adjtimex()

On Sun, 2007-03-25 at 13:14 +0200, Ingo Molnar wrote:
> * Thomas Gleixner <tglx@...utronix.de> wrote:
> 
> > Here you go. It's ugly, but it should do the trick for now.
> > 
> > 	tglx
> 
> here's your patch with proper metadata:
> 
> --------------------->
> From: Thomas Gleixner <tglx@...utronix.de>
> Subject: [patch] ntp: avoid integer overflow in do_adjtimex()
> 
> John Stultz traced back ntpd problems to the following issue: 
> do_adjtimex() [used by ntpd] can overflow if there's a too long delay 
> between timer interrupts - as it can happen on NO_HZ. Expand the 
> time_adjust calculation/division from 32 bits to 64 bits.

Wrong metadata. This is a patch to fix John's patch vs. signedness.

	tglx



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