linux-kernel - Re: [patch] mm: vmap fix overflow

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Message-ID: <20090212023002.GB23790@wotan.suse.de>
Date:	Thu, 12 Feb 2009 03:30:02 +0100
From:	Nick Piggin <npiggin@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	hch@...radead.org, linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: [patch] mm: vmap fix overflow

On Wed, Feb 11, 2009 at 06:20:50PM -0800, Andrew Morton wrote:
> On Thu, 12 Feb 2009 02:39:31 +0100 Nick Piggin <npiggin@...e.de> wrote:
> > 
> > Oh that's true, good catch. I guess that should be (addr + size - 1)?
> > Because we care about the last byte that was actually allocated to us
> > (inclusive, rather than exclusive).
> 
> That would work.  It wouldd give weird results for size==0, but probably
> that's already checked for somewhere(?)

It's checked down in __get_vm_area_node.

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