linux-kernel - Re: [PATCH 06/31] serial: qcom_geni_serial: fix potential mem leak in qcom_geni_serial

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Message-ID: <20210104070236.mnnj3frjtxka7emu@vireshk-i7>
Date:   Mon, 4 Jan 2021 12:32:36 +0530
From:   Viresh Kumar <viresh.kumar@...aro.org>
To:     Yangtao Li <tiny.windzz@...il.com>
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Subject: Re: [PATCH 06/31] serial: qcom_geni_serial: fix potential mem leak
 in qcom_geni_serial_probe()

On 01-01-21, 16:54, Yangtao Li wrote:
> We should use dev_pm_opp_put_clkname() to free opp table each time
> dev_pm_opp_of_add_table() got error.
> 
> Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
> ---
>  drivers/tty/serial/qcom_geni_serial.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/tty/serial/qcom_geni_serial.c b/drivers/tty/serial/qcom_geni_serial.c
> index 291649f02821..5aada7ebae35 100644
> --- a/drivers/tty/serial/qcom_geni_serial.c
> +++ b/drivers/tty/serial/qcom_geni_serial.c
> @@ -1438,9 +1438,12 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
>  		return PTR_ERR(port->se.opp_table);
>  	/* OPP table is optional */
>  	ret = dev_pm_opp_of_add_table(&pdev->dev);
> -	if (ret && ret != -ENODEV) {
> -		dev_err(&pdev->dev, "invalid OPP table in device tree\n");
> -		goto put_clkname;
> +	if (ret) {
> +		dev_pm_opp_put_clkname(port->se.opp_table);
> +		if (ret != -ENODEV) {
> +			dev_err(&pdev->dev, "invalid OPP table in device tree\n");
> +			return ret;
> +		}
>  	}
>  
>  	port->private_data.drv = drv;
> @@ -1482,7 +1485,6 @@ static int qcom_geni_serial_probe(struct platform_device *pdev)
>  	return 0;
>  err:
>  	dev_pm_opp_of_remove_table(&pdev->dev);
> -put_clkname:
>  	dev_pm_opp_put_clkname(port->se.opp_table);
>  	return ret;
>  }

Since put_clkname is always done in remove(), I don't think there is
any memleak here. Over that with your patch we will do put_clkname
twice now, once in probe and once in remove. And that is a bug AFAICT.

-- 
viresh