linux-kernel - Re: [PATCH] cpufreq: kryo: Fix possible error code dereference

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Message-ID: <20180615024625.rzr4644n77zrtomm@vireshk-i7>
Date:   Fri, 15 Jun 2018 08:16:25 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     ilia.lin@...il.com
Cc:     Ilia Lin <ilialin@...eaurora.org>,
        "Rafael J . Wysocki" <rjw@...ysocki.net>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: kryo: Fix possible error code dereference

On 14-06-18, 22:29, ilia.lin@...il.com wrote:
> From: Ilia Lin <ilia.lin@...il.com>
> 
> In event of error returned by the nvmem_cell_read() non-pointer value
> may be dereferenced. Fix this with error handling.
> 
> Signed-off-by: Ilia Lin <ilia.lin@...il.com>

Fixes tag ?

> ---
>  drivers/cpufreq/qcom-cpufreq-kryo.c | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/cpufreq/qcom-cpufreq-kryo.c b/drivers/cpufreq/qcom-cpufreq-kryo.c
> index d049fe4b80c4..5e9511223ce9 100644
> --- a/drivers/cpufreq/qcom-cpufreq-kryo.c
> +++ b/drivers/cpufreq/qcom-cpufreq-kryo.c
> @@ -115,6 +115,8 @@ static int qcom_cpufreq_kryo_probe(struct platform_device *pdev)
>  
>  	speedbin = nvmem_cell_read(speedbin_nvmem, &len);
>  	nvmem_cell_put(speedbin_nvmem);
> +	if (IS_ERR(speedbin))
> +		return PTR_ERR(speedbin);
>  
>  	switch (msm8996_version) {
>  	case MSM8996_V3:
> -- 
> 2.11.0

-- 
viresh