linux-kernel - Re: [PATCH] arm/mach-omap2/display: fix possible object reference leak

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Message-ID: <20190219175814.GO15711@atomide.com>
Date:   Tue, 19 Feb 2019 09:58:14 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Julia Lawall <julia.lawall@...6.fr>
Cc:     Peng Hao <peng.hao2@....com.cn>, linux-omap@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Tomi Valkeinen <tomi.valkeinen@...com>,
        Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        wen.yang99@....com.cn
Subject: Re: [PATCH] arm/mach-omap2/display: fix possible object reference
 leak

* Julia Lawall <julia.lawall@...6.fr> [190219 17:33]:
> On Tue, 19 Feb 2019, Tony Lindgren wrote:
> > In general, if the device tree node is never used afterwards,
> > should this be just:
> >
> > 	r = of_platform_populate(node, NULL, NULL, &pdev->dev);
> > 	of_node_put(dev_node);
> > 	if (r) {
> > 		...
> > 	}
> >
> > If so, Julia might have a Coccinelle recpipe for it?
> 
> Unfortunately this is not really an ideal case for Coccinelle, because
> node is the result of calling a local function and Coccinelle doesn't by
> default do any interprocedural analysis.  It is possible to write a rule
> that explicitly looks for one function that returns a device node and then
> the pattern of its usage in the caller, though.

OK thanks for the information.

Regards,

Tony