linux-kernel - Re: [PATCH] mm: incorrect overflow check in shrink

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Date:	Thu, 1 Dec 2011 12:54:57 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Cc:	Xi Wang <xi.wang@...il.com>, Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	Johannes Weiner <jweiner@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: incorrect overflow check in shrink_slab()

On Thu, 1 Dec 2011 18:32:02 +0900
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com> wrote:

> > total_scan is unsigned long, so the overflow check (total_scan < 0)
> > didn't work.
> > 
> > Signed-off-by: Xi Wang <xi.wang@...il.com>
> 
> Nice catch but.... the 'total_scan" shouldn't be long ?
> Rather than type casting ?

Konstantin Khlebnikov's "vmscan: fix initial shrinker size handling"
does change it to `long'.  That patch is in -mm and linux-next and is
queued for 3.3.  It was queued for 3.2 but didn't make it due to some
me/Dave Chinner confusion.


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