linux-kernel - Re: [PATCH 7/7] cpufreq: ppc_cbe: fix possible object reference leak

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Message-ID: <alpine.DEB.2.20.1904021515000.3297@hadrien>
Date:   Tue, 2 Apr 2019 15:15:19 +0200 (CEST)
From:   Julia Lawall <julia.lawall@...6.fr>
To:     Markus Elfring <Markus.Elfring@....de>
cc:     Wen Yang <wen.yang99@....com.cn>, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Yi Wang <wang.yi59@....com.cn>
Subject: Re: [PATCH 7/7] cpufreq: ppc_cbe: fix possible object reference
 leak



On Tue, 2 Apr 2019, Markus Elfring wrote:

> > @@ -86,6 +86,7 @@ static int cbe_cpufreq_cpu_init(struct cpufreq_policy *policy)
> >  	if (!cbe_get_cpu_pmd_regs(policy->cpu) ||
> >  	    !cbe_get_cpu_mic_tm_regs(policy->cpu)) {
> >  		pr_info("invalid CBE regs pointers for cpufreq\n");
> > +		of_node_put(cpu);
> >  		return -EINVAL;
> >  	}
>
> I have taken another look at the implementation of this function.
> I find that the second statement “return -EINVAL” would need related
> source code adjustments.
> https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/cpufreq/ppc_cbe_cpufreq.c?id=05d08e2995cbe6efdb993482ee0d38a77040861a#n96
>
> How do you think about to complete the exception handling here?

There is an of_node_put two lines above.

julia