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

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Message-ID: <1e951bad-1f26-6de2-43be-b1b5dc384794@gmail.com>
Date:   Tue, 26 Apr 2022 13:38:20 +0200
From:   Matthias Brugger <matthias.bgg@...il.com>
To:     Wan Jiabing <wanjiabing@...o.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        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 26/04/2022 13:17, 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>

Reviewed-by: Matthias Brugger <matthias.bgg@...il.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;
>   	}
>