linux-kernel - Re: [PATCH] cpufreq: mediatek: Fix NULL pointer dereference in mediatek-cpufreq

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Date:   Wed, 27 Apr 2022 08:48:01 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Wan Jiabing <wanjiabing@...o.com>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Rex-BC Chen <rex-bc.chen@...iatek.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org
Subject: Re: [PATCH] cpufreq: mediatek: Fix NULL pointer dereference in
 mediatek-cpufreq

On 26-04-22, 19:17, Wan Jiabing wrote:
> Fix following coccicheck error:
> drivers/cpufreq/mediatek-cpufreq.c:464:16-23: ERROR: info is NULL but dereferenced.
> 
> Use pr_err instead of dev_err to avoid dereferring a NULL pointer.
> 
> Fixes: f52b16ba9fe4 ("cpufreq: mediatek: Use device print to show logs")
> Signed-off-by: Wan Jiabing <wanjiabing@...o.com>
> ---
>  drivers/cpufreq/mediatek-cpufreq.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/cpufreq/mediatek-cpufreq.c b/drivers/cpufreq/mediatek-cpufreq.c
> index bcabb3726a5b..901042e9a240 100644
> --- a/drivers/cpufreq/mediatek-cpufreq.c
> +++ b/drivers/cpufreq/mediatek-cpufreq.c
> @@ -461,8 +461,8 @@ static int mtk_cpufreq_init(struct cpufreq_policy *policy)
>  
>  	info = mtk_cpu_dvfs_info_lookup(policy->cpu);
>  	if (!info) {
> -		dev_err(info->cpu_dev,
> -			"dvfs info for cpu%d is not initialized.\n", policy->cpu);
> +		pr_err("dvfs info for cpu%d is not initialized.\n",
> +			policy->cpu);
>  		return -EINVAL;
>  	}

Applied. Thanks.

-- 
viresh