linux-kernel - Re: [PATCH] leds-gpio: Fix error handling and memory leak

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Date:	Thu, 26 Mar 2015 09:55:59 -0500
From:	Corey Minyard <cminyard@...sta.com>
To:	minyard@....org, Raphael Assenat <raph@...com>
CC:	linux-leds@...r.kernel.org,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] leds-gpio: Fix error handling and memory leak

Ping.  This is a rather obvious fix and can result in an oops.

-corey

On 03/09/2015 07:43 PM, minyard@....org wrote:
> From: Corey Minyard <cminyard@...sta.com>
>
> The leds-gpio driver would not clean up properly if it failed in some
> places, and it wasn't freeing its private data.
>
> Signed-off-by: Corey Minyard <cminyard@...sta.com>
> ---
>  drivers/leds/leds-gpio.c | 13 +++++++++----
>  1 file changed, 9 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/leds/leds-gpio.c b/drivers/leds/leds-gpio.c
> index d26af0a..32f7642 100644
> --- a/drivers/leds/leds-gpio.c
> +++ b/drivers/leds/leds-gpio.c
> @@ -198,8 +198,10 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
>  		} else {
>  			if (IS_ENABLED(CONFIG_OF) && !led.name && np)
>  				led.name = np->name;
> -			if (!led.name)
> -				return ERR_PTR(-EINVAL);
> +			if (!led.name) {
> +				ret = -EINVAL;
> +				goto err;
> +			}
>  		}
>  		fwnode_property_read_string(child, "linux,default-trigger",
>  					    &led.default_trigger);
> @@ -217,19 +219,21 @@ static struct gpio_leds_priv *gpio_leds_create(struct platform_device *pdev)
>  		if (fwnode_property_present(child, "retain-state-suspended"))
>  			led.retain_state_suspended = 1;
>  
> -		ret = create_gpio_led(&led, &priv->leds[priv->num_leds++],
> +		ret = create_gpio_led(&led, &priv->leds[priv->num_leds],
>  				      dev, NULL);
>  		if (ret < 0) {
>  			fwnode_handle_put(child);
>  			goto err;
>  		}
> +		priv->num_leds++;
>  	}
>  
>  	return priv;
>  
>  err:
> -	for (count = priv->num_leds - 2; count >= 0; count--)
> +	for (count = priv->num_leds - 1; count >= 0; count--)
>  		delete_gpio_led(&priv->leds[count]);
> +	devm_kfree(dev, priv);
>  	return ERR_PTR(ret);
>  }
>  
> @@ -283,6 +287,7 @@ static int gpio_led_remove(struct platform_device *pdev)
>  
>  	for (i = 0; i < priv->num_leds; i++)
>  		delete_gpio_led(&priv->leds[i]);
> +	devm_kfree(&pdev->dev, priv);
>  
>  	return 0;
>  }

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