linux-kernel - Re: [RFC][PATCH 4/5] mm/zpool: allow NULL `zpool' pointer in zpool_destroy

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Message-ID: <20150610235836.GB499@swordfish>
Date:	Thu, 11 Jun 2015 08:58:36 +0900
From:	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
To:	Dan Streetman <ddstreet@...e.org>
Cc:	Joe Perches <joe@...ches.com>,
	Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Hocko <mhocko@...e.cz>,
	David Rientjes <rientjes@...gle.com>,
	Linux-MM <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>
Subject: Re: [RFC][PATCH 4/5] mm/zpool: allow NULL `zpool' pointer in
 zpool_destroy_pool()

On (06/10/15 16:59), Dan Streetman wrote:
> On Tue, Jun 9, 2015 at 8:04 AM, Sergey Senozhatsky
> <sergey.senozhatsky@...il.com> wrote:
> > zpool_destroy_pool() does not tolerate a NULL zpool pointer
> > argument and performs a NULL-pointer dereference. Although
> > there is only one zpool_destroy_pool() user (as of 4.1),
> > still update it to be coherent with the corresponding
> > destroy() functions of the remainig pool-allocators (slab,
> > mempool, etc.), which now allow NULL pool-pointers.
> >
> > For consistency, tweak zpool_destroy_pool() and NULL-check the
> > pointer there.
> >
> > Proposed by Andrew Morton.
> >
> > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@...il.com>
> > Reported-by: Andrew Morton <akpm@...ux-foundation.org>
> > LKML-reference: https://lkml.org/lkml/2015/6/8/583
> 
> Acked-by: Dan Streetman <ddstreet@...e.org>

Thanks.

Shall we ask Joe to add zpool_destroy_pool() to the
"$func(NULL) is safe and this check is probably not required" list?

	-ss

> > ---
> >  mm/zpool.c | 3 +++
> >  1 file changed, 3 insertions(+)
> >
> > diff --git a/mm/zpool.c b/mm/zpool.c
> > index bacdab6..2f59b90 100644
> > --- a/mm/zpool.c
> > +++ b/mm/zpool.c
> > @@ -202,6 +202,9 @@ struct zpool *zpool_create_pool(char *type, char *name, gfp_t gfp,
> >   */
> >  void zpool_destroy_pool(struct zpool *zpool)
> >  {
> > +       if (unlikely(!zpool))
> > +               return;
> > +
> >         pr_info("destroying pool type %s\n", zpool->type);
> >
> >         spin_lock(&pools_lock);
> > --
> > 2.4.3.368.g7974889
> >
> > --
> > To unsubscribe, send a message with 'unsubscribe linux-mm' in
> > the body to majordomo@...ck.org.  For more info on Linux MM,
> > see: http://www.linux-mm.org/ .
> > Don't email: <a href=mailto:"dont@...ck.org"> email@...ck.org </a>
> 
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