linux-kernel - Re: [RFC v3 2/5] slab: implement slab object boundaries assertion

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Message-ID: <alpine.DEB.2.00.1107211127050.3995@router.home>
Date:	Thu, 21 Jul 2011 11:28:04 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Vasiliy Kulikov <segoon@...nwall.com>
cc:	linux-kernel@...r.kernel.org, Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Al Viro <viro@...iv.linux.org.uk>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC v3 2/5] slab: implement slab object boundaries assertion

On Thu, 21 Jul 2011, Vasiliy Kulikov wrote:

> +bool slab_access_ok(const void *ptr, unsigned long len)
> +{
> +	struct page *page;
> +	struct kmem_cache *s = NULL;

Useless assignment.

> +	unsigned long offset;
> +
> +	if (!virt_addr_valid(ptr))
> +		return true;
> +	page = virt_to_head_page(ptr);
> +	if (!PageSlab(page))
> +		return true;
> +
> +	s = page->slab;
> +	offset = (ptr - page_address(page)) % s->size;
> +	if (offset <= s->objsize && len <= s->objsize - offset)
> +		return true;

I thought this was going to be offset < s->objectsize ...?
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