linux-kernel - Re: [BUG]memblock: fix overflow of array index

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Message-Id: <20120425.183121.1283820821646106475.davem@davemloft.net>
Date:	Wed, 25 Apr 2012 18:31:21 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	hpa@...ux.intel.com
Cc:	tj@...nel.org, htmldeveloper@...il.com,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	mingo@...e.hu, linux-mm@...ck.org
Subject: Re: [BUG]memblock: fix overflow of array index

From: "H. Peter Anvin" <hpa@...ux.intel.com>
Date: Wed, 25 Apr 2012 15:29:31 -0700

> On 04/25/2012 03:28 PM, Tejun Heo wrote:
>> 
>> All indexes in memblock are integers.  Changing that particular one to
>> unsigned int doesn't fix anything.  I think it just makes things more
>> confusing.  If there ever are cases w/ more then 2G memblocks, we're
>> going for 64bit not unsigned.
>> 
> 
> I would expect there to be plenty of memblocks larger than 2G?

Yes, but not the array indexes into those memblock entries, which is
what this patch is about.
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