linux-kernel - Re: [ 11/21] hwmon: (sht15) Check return value of regulator

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Date:	Sat, 16 Mar 2013 04:15:24 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	Guenter Roeck <linux@...ck-us.net>
Subject: Re: [ 11/21] hwmon: (sht15) Check return value of regulator_enable()

On Tue, 2013-03-12 at 15:44 -0700, Greg Kroah-Hartman wrote:
> 3.0-stable review patch.  If anyone has any objections, please let me know.
> 
> ------------------
> 
> From: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> 
> commit 3e78080f81481aa8340374d5a37ae033c1cf4272 upstream.
> 
> Not having power is a pretty serious error so check that we are able to
> enable the supply and error out if we can't.
> 
> Signed-off-by: Mark Brown <broonie@...nsource.wolfsonmicro.com>
> Signed-off-by: Guenter Roeck <linux@...ck-us.net>

> ---
>  drivers/hwmon/sht15.c |    8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 
> --- a/drivers/hwmon/sht15.c
> +++ b/drivers/hwmon/sht15.c
> @@ -926,7 +926,13 @@ static int __devinit sht15_probe(struct
>  		if (voltage)
>  			data->supply_uV = voltage;
>  
> -		regulator_enable(data->reg);
> +		ret = regulator_enable(data->reg);
> +		if (ret != 0) {
> +			dev_err(&pdev->dev,
> +				"failed to enable regulator: %d\n", ret);
> +			return ret;
> +		}
> +
>  		/*
>  		 * Setup a notifier block to update this if another device
>  		 * causes the voltage to change

Since this has now been released, I think you need this follow-up fix in
3.0.y and 3.4.y:

---
From: Ben Hutchings <ben@...adent.org.uk>
Subject: hwmon: sht15: Fix memory leak if regulator_enable() fails
Date: Sat, 16 Mar 2013 04:11:01 +0000

Commit 3e78080f8148 ('hwmon: (sht15) Check return value of
regulator_enable()') depends on the use of devm_kmalloc() for automatic
resource cleanup in the failure cases, which was introduced in 3.7.  In
older stable branches, explicit cleanup is needed.

Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
--- a/drivers/hwmon/sht15.c
+++ b/drivers/hwmon/sht15.c
@@ -930,7 +930,7 @@
 		if (ret != 0) {
 			dev_err(&pdev->dev,
 				"failed to enable regulator: %d\n", ret);
-			return ret;
+			goto err_free_data;
 		}
 
 		/*


-- 
Ben Hutchings
It is easier to change the specification to fit the program than vice versa.

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