linux-kernel - Re: [PATCH] iio: adc: men_z188_adc: Fix a resource leak in an error handling path

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Date:   Sun, 30 Jan 2022 13:51:55 +0000
From:   Jonathan Cameron <jic23@...nel.org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Johannes Thumshirn <johannes.thumshirn@....de>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-iio@...r.kernel.org
Subject: Re: [PATCH] iio: adc: men_z188_adc: Fix a resource leak in an error
 handling path

On Sat, 29 Jan 2022 09:32:47 +0100
Christophe JAILLET <christophe.jaillet@...adoo.fr> wrote:

> If iio_device_register() fails, a previous ioremap() is left unbalanced.
> 
> Update the error handling path and add the missing iounmap() call, as
> already done in the remove function.
> 
> Fixes: 74aeac4da66f ("iio: adc: Add MEN 16z188 ADC driver")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
This is a good target for a devm_ conversion at somepoint, but this
is indeed the minimal fix so we should do this first.

Applied to the fixes-togreg branch of iio.git and marked for stable.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/men_z188_adc.c | 9 ++++++++-
>  1 file changed, 8 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/adc/men_z188_adc.c b/drivers/iio/adc/men_z188_adc.c
> index 42ea8bc7e780..adc5ceaef8c9 100644
> --- a/drivers/iio/adc/men_z188_adc.c
> +++ b/drivers/iio/adc/men_z188_adc.c
> @@ -103,6 +103,7 @@ static int men_z188_probe(struct mcb_device *dev,
>  	struct z188_adc *adc;
>  	struct iio_dev *indio_dev;
>  	struct resource *mem;
> +	int ret;
>  
>  	indio_dev = devm_iio_device_alloc(&dev->dev, sizeof(struct z188_adc));
>  	if (!indio_dev)
> @@ -128,8 +129,14 @@ static int men_z188_probe(struct mcb_device *dev,
>  	adc->mem = mem;
>  	mcb_set_drvdata(dev, indio_dev);
>  
> -	return iio_device_register(indio_dev);
> +	ret = iio_device_register(indio_dev);
> +	if (ret)
> +		goto err_unmap;
> +
> +	return 0;
>  
> +err_unmap:
> +	iounmap(adc->base);
>  err:
>  	mcb_release_mem(mem);
>  	return -ENXIO;