linux-kernel - Re: [PATCH 2/2] drivers/mtd/maps/lantiq-flash.c: drop iounmap for devm

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Date:	Tue, 27 Dec 2011 09:36:04 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	Artem Bityutskiy <dedekind1@...il.com>
cc:	David Woodhouse <dwmw2@...radead.org>,
	kernel-janitors@...r.kernel.org, linux-mtd@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] drivers/mtd/maps/lantiq-flash.c: drop iounmap for
 devm_ allocated data

On Tue, 27 Dec 2011, Artem Bityutskiy wrote:

> On Mon, 2011-12-26 at 18:38 +0100, Julia Lawall wrote:
>> From: Julia Lawall <julia@...u.dk>
>>
>> Data allocated with devm_ioremap or devm_ioremap_nocache should not be
>> freed using iounmap, because doing so causes a dangling pointer, and a
>> subsequent double free.
>>
>> The semantic match that finds this problem is as follows:
>> (http://coccinelle.lip6.fr/)
>>
>> // <smpl>
>> @r@
>> expression x;
>> @@
>> (
>>  x = devm_ioremap(...)
>> |
>>  x = devm_ioremap_nocache(...)
>> )
>>
>> @@
>> expression r.x;
>> @@
>> * iounmap(x)
>> // </smpl>
>
> Thanks Julia,
>
> surely this semantic patch script is worth adding to scripts/coccinelle?
> Are you going to take care of this?

OK, I will do that.

julia
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