linux-kernel - Re: [linux-next-20130422] Bug in SLAB?

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Message-ID: <0000013e5b5de8c2-75b84016-0faf-4b7f-b5e5-e40eb67552ab-000000@email.amazonses.com>
Date:	Tue, 30 Apr 2013 14:34:41 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
cc:	glommer@...allels.com, penberg@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [linux-next-20130422] Bug in SLAB?

On Tue, 30 Apr 2013, Tetsuo Handa wrote:

> Current diff is:

[off by one stuff okay]

> diff --git a/include/linux/slab_def.h b/include/linux/slab_def.h
> index 113ec08..be1446a 100644
> --- a/include/linux/slab_def.h
> +++ b/include/linux/slab_def.h
> @@ -126,6 +126,9 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
>  		if (!size)
>  			return ZERO_SIZE_PTR;
>
> +		if (size > KMALLOC_MAX_SIZE)
> +			goto not_found;
> +
>  		i = kmalloc_index(size);

Why is this needed? kmalloc_index should BUG() for too large allocs.

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