Re: 9pfs double kfree

[Balbir Singh]

On 3/6/06, David S. Miller <davem@xxxxxxxxxxxxx> wrote:
> From: Dave Jones <davej@xxxxxxxxxx>
> Date: Mon, 6 Mar 2006 02:04:58 -0500
>
> > (I wish we had a kfree variant that NULL'd the target when it was free'd)
>
> Excellent idea.
> -

Slab debugging should catch double frees, but it will not attract your
attention till you see your dmesg log. kfree() will ignore NULL
pointer, from the comments in kfree

/**
  * kfree - free previously allocated memory
  * @objp: pointer returned by kmalloc.
 *
  * If @objp is NULL, no operation is performed.
<snip>

May we could have such a variant under CONFIG_DEBUG_SLAB if we needed
and also change the variant kfree to BUG_ON() a NULL pointer.

Balbir
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