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

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Message-ID: <20170709181023.54458b6c@kernel.org>
Date:   Sun, 9 Jul 2017 18:10:23 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Peter Rosin <peda@...ntia.se>
Cc:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>,
        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

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!

Jonathan  
> 
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