linux-kernel - Re: [PATCH] iio: multiplexer: add NULL check on devm_kzalloc() and devm

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Message-ID: <20170710144423.Horde.7iJn7zvwA-jFfY4uTu7coYW@gator4166.hostgator.com>
Date:   Mon, 10 Jul 2017 14:44:23 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     Jonathan Cameron <jic23@...nel.org>
Cc:     Peter Rosin <peda@...ntia.se>, Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: multiplexer: add NULL check on devm_kzalloc() and
 devm_kmemdup() return values

Hi Jonathan,

Quoting Jonathan Cameron <jic23@...nel.org>:

> On Fri, 7 Jul 2017 11:26:35 +0200
> Peter Rosin <peda@...ntia.se> wrote:
>
>> On 2017-07-07 06:57, Peter Rosin wrote:
>> > On 2017-07-07 06:53, Gustavo A. R. Silva wrote:
>> >> Check return values from call to devm_kzalloc() and devm_kmemup()
>> >
>> > If someone cares enough: s/devm_kmemup/evm_kmemdup/
>>
>> Strange, there seems to be some inherent shortage of 'd' characters...
>>
>> Cheers,
>> pea :-)
>>
>> >
>> >> 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
>> >>
>> >> Cc: Peter Rosin <peda@...ntia.se>
>> >> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
>> >
>> > Either way,
>> >
>> > Reviewed-by: Peter Rosin <peda@...ntia.se>
>> >
>> > Thanks!
>> >
> The relevant patch adding the file in questions hasn't yet worked it's
> way back to the iio tree so I can't apply this until it does.
>
> That is likely to be a few weeks away yet.  Please give me a poke if
> I seem to have forgotten it!
>

OK, I will do that. :)

Thanks!
--
Gustavo A. R. Silva