linux-kernel - Re: [Cocci] [PATCH v2] coccinelle: api: check for propagation of error from platform_get

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Message-ID: <alpine.DEB.2.02.1512271239460.2038@localhost6.localdomain6>
Date:	Sun, 27 Dec 2015 12:41:30 +0100 (CET)
From:	Julia Lawall <julia.lawall@...6.fr>
To:	SF Markus Elfring <elfring@...rs.sourceforge.net>
cc:	Julia Lawall <julia.lawall@...6.fr>,
	Coccinelle <cocci@...teme.lip6.fr>,
	LKML <linux-kernel@...r.kernel.org>,
	kernel-janitors@...r.kernel.org, linux-media@...r.kernel.org,
	netdev@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-spi@...r.kernel.org, dri-devel@...ts.freedesktop.org,
	Gilles Muller <Gilles.Muller@...6.fr>,
	Michal Marek <mmarek@...e.com>,
	Nicolas Palix <nicolas.palix@...g.fr>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
Subject: Re: [Cocci] [PATCH v2] coccinelle: api: check for propagation of
 error from platform_get_irq



On Sun, 27 Dec 2015, SF Markus Elfring wrote:

> > The error return value of platform_get_irq seems to often get dropped.
> 
> How do you think about any more fine-tuning here?
> 
> Commit message:
> * … of the platform_get_irq() function seems to get dropped too often.
> 
> * Why do you concentrate on a single function name?
>   Do you plan to extend this source code analysis approach?
> 
> 
> > +@...ipt:python r_report depends on report@
> > +j0 << r.j0;
> > +j1 << r.j1;
> > +@@
> > +
> > +msg = "Propagate return value of platform_get_irq around line %s." % (j1[0].line)
> 
> Are there more unchecked return values which are interesting
> for further considerations?
> https://cwe.mitre.org/data/definitions/252.html

The value is not unchecked.  I made a specific rule because the specific 
problem is quite common.

julia