linux-kernel - Re: [PATCH] regulator: cros-ec-regulator: Fix double free of desc->name.

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Date:   Tue, 28 Jul 2020 11:34:03 +0200
From:   Enric Balletbo i Serra <enric.balletbo@...labora.com>
To:     Pi-Hsun Shih <pihsun@...omium.org>
Cc:     Liam Girdwood <lgirdwood@...il.com>,
        Mark Brown <broonie@...nel.org>,
        Benson Leung <bleung@...omium.org>,
        Guenter Roeck <groeck@...omium.org>,
        Prashant Malani <pmalani@...omium.org>,
        "open list:VOLTAGE AND CURRENT REGULATOR FRAMEWORK" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] regulator: cros-ec-regulator: Fix double free of
 desc->name.

Hi Pi-Hsun,

Thank you for your patch and to send upstream.

On 28/7/20 11:19, Pi-Hsun Shih wrote:
> The desc->name field is allocated with devm_kstrdup, but is also kfreed
> on the error path, causing it to be double freed. Remove the kfree on
> the error path.
> 
> Fixes: 8d9f8d57e023 ("regulator: Add driver for cros-ec-regulator")
> Signed-off-by: Pi-Hsun Shih <pihsun@...omium.org>

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@...labora.com>

> ---
>  drivers/regulator/cros-ec-regulator.c | 7 +------
>  1 file changed, 1 insertion(+), 6 deletions(-)
> 
> diff --git a/drivers/regulator/cros-ec-regulator.c b/drivers/regulator/cros-ec-regulator.c
> index 35f97246bc48..cee259eb0213 100644
> --- a/drivers/regulator/cros-ec-regulator.c
> +++ b/drivers/regulator/cros-ec-regulator.c
> @@ -222,18 +222,13 @@ static int cros_ec_regulator_probe(struct platform_device *pdev)
>  
>  	drvdata->dev = devm_regulator_register(dev, &drvdata->desc, &cfg);
>  	if (IS_ERR(drvdata->dev)) {
> -		ret = PTR_ERR(drvdata->dev);
>  		dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
> -		goto free_name;
> +		return PTR_ERR(drvdata->dev);
>  	}
>  
>  	platform_set_drvdata(pdev, drvdata);
>  
>  	return 0;
> -
> -free_name:
> -	kfree(desc->name);
> -	return ret;
>  }
>  
>  static const struct of_device_id regulator_cros_ec_of_match[] = {
> 
> base-commit: 8d9f8d57e023893bfa708d83e3a787e77766a378
>