linux-kernel - Re: Misuses of ** ? (was Re: [PATCH 1/1] ASoC: Intel: Atom: add a missing star in a memcpy call)

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Message-ID: <1472416453.26978.115.camel@perches.com>
Date:   Sun, 28 Aug 2016 13:34:13 -0700
From:   Joe Perches <joe@...ches.com>
To:     Julia Lawall <julia.lawall@...6.fr>,
        Nicolas Iooss <nicolas.iooss_linux@....org>
Cc:     alsa-devel@...a-project.org, Dan Capenter <error27@...il.com>,
        Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: Misuses of ** ? (was Re: [PATCH 1/1] ASoC: Intel: Atom: add a
 missing star in a memcpy call)

On Sun, 2016-08-28 at 21:38 +0200, Julia Lawall wrote:
> On Sun, 28 Aug 2016, Nicolas Iooss wrote:
> > On 28/08/16 19:50, Joe Perches wrote:
> > > On Sun, 2016-08-28 at 19:39 +0200, Nicolas Iooss wrote:
> > >> In sst_prepare_and_post_msg(), when a response is received in "block",
> > >> the following code gets executed:
> > >>
> > >>     *data = kzalloc(block->size, GFP_KERNEL);
> > >>     memcpy(data, (void *) block->data, block->size);
> > >
> > > Yuck, thanks.
> > >
> > > Julia, Dan, could cocci or smatch help find any other
> > > similar misuses here?
[]
> I tried the following semantic patch, that is quite general, and the fixed
> issue was the only report.
> 
> @@
> expression x,y,sz;
> identifier f,g;
> @@
> 
> * *x = f(sz,...);
>   ...
> * g(x,y,sz);

Hi Julia,

This would find exactly the same form, but I think
the question is are there assignments of a **pp
that should have been *pp

Something like:

@@
type P;
P **pp;
@@

* pp = <alloc>\|<copy>\|<access>(..., sizeof(P), ...)