Re: 9pfs double kfree

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On 3/6/06, David S. Miller <[email protected]> wrote:
> From: Dave Jones <[email protected]>
> 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.

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.

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