linux-kernel - Re: [PATCH] platform/x86: fujitsu-laptop: add NULL check on devm

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Date:   Mon, 10 Jul 2017 14:37:30 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Darren Hart <dvhart@...radead.org>
Cc:     Jonathan Woithe <jwoithe@...t42.net>,
        Andy Shevchenko <andy@...radead.org>,
        platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] platform/x86: fujitsu-laptop: add NULL check on
 devm_kzalloc() return value

Hi Darren, Jonathan,

Quoting Darren Hart <dvhart@...radead.org>:

> On Fri, Jul 07, 2017 at 09:49:00AM +0930, Jonathan Woithe wrote:
>> On Thu, Jul 06, 2017 at 05:19:02PM -0500, Gustavo A. R. Silva wrote:
>> > Check return value from call to devm_kzalloc()
>> > in order to prevent a NULL pointer dereference.
>> >
>> > This issue was detected using Coccinelle and the following semantic patch:
>> >
>> > @@
>> > expression x;
>> > identifier fld;
>> > @@
>> >
>> > * x = devm_kzalloc(...);
>> >   ... when != x == NULL
>> >   x->fld
>> >
>> > Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>>
>> These checks should be added in the interest of code correctness.
>> devm_kzalloc() can fail (even if it's extremely unlikely in practice) so we
>> should check for this.
>>
>> Reviewed-by: Jonathan Woithe <jwoithe@...t42.net>
>
> Thanks Gustavo and Jonathan,
>
> Queued to testing.
>

Glad to help. :)

Thanks
--
Gustavo A. R. Silva