linux-kernel - Re: [PATCH] cpufreq: Avoid a bad reference count on CPU node

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Message-ID: <20241001063220.dj53f3dbdiwnpkrh@vireshk-i7>
Date: Tue, 1 Oct 2024 12:02:20 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Miquel Sabaté Solà <mikisabate@...il.com>
Cc: rafael@...nel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: Avoid a bad reference count on CPU node

On 17-09-24, 15:42, Miquel Sabaté Solà wrote:
> In the parse_perf_domain function, if the call to
> of_parse_phandle_with_args returns an error, then the reference to the
> CPU device node that was acquired at the start of the function would not
> be properly decremented.
> 
> Address this by declaring the variable with the __free(device_node)
> cleanup attribute.
> 
> Signed-off-by: Miquel Sabaté Solà <mikisabate@...il.com>
> ---
>  include/linux/cpufreq.h | 6 +-----
>  1 file changed, 1 insertion(+), 5 deletions(-)
> 
> diff --git a/include/linux/cpufreq.h b/include/linux/cpufreq.h
> index d4d2f4d1d7cb..aabec598f79a 100644
> --- a/include/linux/cpufreq.h
> +++ b/include/linux/cpufreq.h
> @@ -1113,10 +1113,9 @@ static inline int parse_perf_domain(int cpu, const char *list_name,
>  				    const char *cell_name,
>  				    struct of_phandle_args *args)
>  {
> -	struct device_node *cpu_np;
>  	int ret;
>  
> -	cpu_np = of_cpu_device_node_get(cpu);
> +	struct device_node *cpu_np __free(device_node) = of_cpu_device_node_get(cpu);
>  	if (!cpu_np)
>  		return -ENODEV;
>  
> @@ -1124,9 +1123,6 @@ static inline int parse_perf_domain(int cpu, const char *list_name,
>  					 args);
>  	if (ret < 0)
>  		return ret;
> -
> -	of_node_put(cpu_np);
> -
>  	return 0;
>  }

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>

-- 
viresh