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

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Date:   Sun, 3 Sep 2017 13:13:28 +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,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: Re: [PATCH] iio: multiplexer: add NULL check on devm_kzalloc() and
 devm_kmemdup() return values

On Sat, 26 Aug 2017 08:09:43 +0200
Peter Rosin <peda@...ntia.se> wrote:

> On 2017-07-09 19:10, Jonathan Cameron wrote:
> > 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!  
> 
> Hi Jonathan!
> 
> I saw a patch from Christophe JAILLET [1] and it seemed familiar so I
> did a bit of digging. Now, I did go back and check this a couple of
> weeks after you request, but iio-mux.c still wasn't in the iio tree,
> and then I did forgot about it. Sorry. But here's the poke...
> 

Applied.  Thanks - this one had completely dropped off the back of my
patch queue. Oops.

Jonathan

> Cheers,
> Peter
> 
> [1] https://lkml.org/lkml/2017/8/26/3
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