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From: Andrew Morton <akpm@linux-foundation.org>
To: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Cc: Minchan Kim <minchan@kernel.org>,
	Christoph Lameter <cl@linux.com>,
	Pekka Enberg <penberg@kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@lge.com>,
	Michal Hocko <mhocko@suse.cz>,
	David Rientjes <rientjes@google.com>,
	linux-mm@kvack.org, linux-kernel@vger.kernel.org,
	sergey.senozhatsky.work@gmail.com, Joe Perches <joe@perches.com>
Subject: Re: [RFC][PATCH 0/5] do not dereference NULL pools in pools' destroy() functions
Date: Tue, 9 Jun 2015 14:25:23 -0700	[thread overview]
Message-ID: <20150609142523.b717dba6033ee08de997c8be@linux-foundation.org> (raw)
In-Reply-To: <1433851493-23685-1-git-send-email-sergey.senozhatsky@gmail.com>

On Tue,  9 Jun 2015 21:04:48 +0900 Sergey Senozhatsky <sergey.senozhatsky@gmail.com> wrote:

> The existing pools' destroy() functions do not allow NULL pool pointers;
> instead, every destructor() caller forced to check if pool is not NULL,
> which:
>  a) requires additional attention from developers/reviewers
>  b) may lead to a NULL pointer dereferences if (a) didn't work
> 
> 
> First 3 patches tweak
> - kmem_cache_destroy()
> - mempool_destroy()
> - dma_pool_destroy()
> 
> to handle NULL pointers.

Well I like it, even though it's going to cause a zillion little cleanup
patches.

checkpatch already has a "kfree(NULL) is safe and this check is
probably not required" test so I guess Joe will need to get busy ;)

I'll park these patches until after 4.1 is released - it's getting to
that time...

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  parent reply	other threads:[~2015-06-09 21:25 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-09 12:04 [RFC][PATCH 0/5] do not dereference NULL pools in pools' destroy() functions Sergey Senozhatsky
2015-06-09 12:04 ` [RFC][PATCH 1/5] mm/slab_common: allow NULL cache pointer in kmem_cache_destroy() Sergey Senozhatsky
2015-06-17 23:14   ` David Rientjes
2015-06-17 23:52     ` Sergey Senozhatsky
2015-06-19 15:50       ` Julia Lawall
2015-08-06 14:21         ` Sergey Senozhatsky
2015-08-06 14:27           ` Julia Lawall
2015-08-06 14:29             ` Sergey Senozhatsky
2015-06-20 16:25       ` Julia Lawall
2015-07-16  8:26         ` Sergey Senozhatsky
2015-06-09 12:04 ` [RFC][PATCH 2/5] mm/mempool: allow NULL `pool' pointer in mempool_destroy() Sergey Senozhatsky
2015-06-17 23:21   ` David Rientjes
2015-06-17 23:54     ` Sergey Senozhatsky
2015-06-09 12:04 ` [RFC][PATCH 3/5] mm/dmapool: allow NULL `pool' pointer in dma_pool_destroy() Sergey Senozhatsky
2015-06-17 23:22   ` David Rientjes
2015-06-09 12:04 ` [RFC][PATCH 4/5] mm/zpool: allow NULL `zpool' pointer in zpool_destroy_pool() Sergey Senozhatsky
2015-06-10 20:59   ` Dan Streetman
2015-06-10 23:58     ` Sergey Senozhatsky
2015-06-11  0:48       ` Joe Perches
2015-06-11  0:59         ` Sergey Senozhatsky
2015-06-11  1:01           ` Dan Streetman
2015-06-09 12:04 ` [RFC][PATCH 5/5] mm/zsmalloc: allow NULL `pool' pointer in zs_destroy_pool() Sergey Senozhatsky
2015-06-09 21:25 ` Andrew Morton [this message]
2015-06-10  0:06   ` [RFC][PATCH 0/5] do not dereference NULL pools in pools' destroy() functions Joe Perches
2015-06-10  4:39     ` [PATCH] checkpatch: Add some <foo>_destroy functions to NEEDLESS_IF tests Joe Perches
2015-06-10  5:52       ` [PATCH V2] " Joe Perches
2015-06-10 10:18         ` Sergey Senozhatsky
2015-06-11  9:41         ` Julia Lawall
2015-06-11  9:51           ` Sergey Senozhatsky
2015-06-11  9:55             ` Julia Lawall
2015-07-14 23:03         ` Andrew Morton
2015-07-15  0:27           ` Sergey Senozhatsky
2015-06-10  5:46     ` [RFC][PATCH 0/5] do not dereference NULL pools in pools' destroy() functions Julia Lawall
2015-06-10  6:41       ` Sergey Senozhatsky
2015-06-10  6:44         ` Julia Lawall
2015-06-10  6:52           ` Sergey Senozhatsky
2015-06-10  1:11   ` Christoph Lameter
2015-06-10  1:51     ` Andrew Morton
2015-06-10  2:00       ` Christoph Lameter
2015-06-10  2:17         ` Andrew Morton
2015-06-10  4:47           ` Joe Perches
2015-06-11 17:26           ` Christoph Lameter
2015-06-11 17:40             ` Andrew Morton
2015-06-10  2:04     ` Sergey Senozhatsky

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