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

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Date:   Fri, 7 Jul 2017 10:02:08 -0700
From:   Darren Hart <dvhart@...radead.org>
To:     Jonathan Woithe <jwoithe@...t42.net>
Cc:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        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

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.

-- 
Darren Hart
VMware Open Source Technology Center