linux-kernel - Re: [RFC][PATCH 3/5] mm/dmapool: allow NULL `pool' pointer in dma_pool

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Message-ID: <alpine.DEB.2.10.1506171621400.8203@chino.kir.corp.google.com>
Date:	Wed, 17 Jun 2015 16:22:46 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Sergey Senozhatsky <sergey.senozhatsky@...il.com>
cc:	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>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, sergey.senozhatsky.work@...il.com
Subject: Re: [RFC][PATCH 3/5] mm/dmapool: allow NULL `pool' pointer in
 dma_pool_destroy()

On Tue, 9 Jun 2015, Sergey Senozhatsky wrote:

> dma_pool_destroy() does not tolerate a NULL dma_pool pointer
> argument and performs a NULL-pointer dereference. This requires
> additional attention and effort from developers/reviewers and
> forces all dma_pool_destroy() callers to do a NULL check
> 
> 	if (pool)
> 		dma_pool_destroy(pool);
> 
> Or, otherwise, be invalid dma_pool_destroy() users.
> 
> Tweak dma_pool_destroy() 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: David Rientjes <rientjes@...gle.com>
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