linux-kernel - Re: [PATCH] iio: adc: adi-axi-adc: Fix refcount leak in adi_axi_adc_attach

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Date:   Fri, 3 Jun 2022 16:29:34 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Miaoqian Lin <linmq006@...il.com>
Cc:     Lars-Peter Clausen <lars@...afoo.de>,
        Michael Hennerich <Michael.Hennerich@...log.com>,
        Alexandru Ardelean <alexandru.ardelean@...log.com>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] iio: adc: adi-axi-adc: Fix refcount leak in
 adi_axi_adc_attach_client

On Tue, 24 May 2022 11:45:17 +0400
Miaoqian Lin <linmq006@...il.com> wrote:

> of_parse_phandle() returns a node pointer with refcount
> incremented, we should use of_node_put() on it when not need anymore.
> Add missing of_node_put() to avoid refcount leak.
> 
> Fixes: ef04070692a2 ("iio: adc: adi-axi-adc: add support for AXI ADC IP core")
> Signed-off-by: Miaoqian Lin <linmq006@...il.com>

Looks 'obviously correct to me' so applied to the fixes togreg branch of iio.git
and marked for stable.

Great if anyone more familiar with this driver than me has a chance
to take a quick look though.

Thanks,

Jonathan

> ---
>  drivers/iio/adc/adi-axi-adc.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/iio/adc/adi-axi-adc.c b/drivers/iio/adc/adi-axi-adc.c
> index a73e3c2d212f..a9e655e69eaa 100644
> --- a/drivers/iio/adc/adi-axi-adc.c
> +++ b/drivers/iio/adc/adi-axi-adc.c
> @@ -322,16 +322,19 @@ static struct adi_axi_adc_client *adi_axi_adc_attach_client(struct device *dev)
>  
>  		if (!try_module_get(cl->dev->driver->owner)) {
>  			mutex_unlock(&registered_clients_lock);
> +			of_node_put(cln);
>  			return ERR_PTR(-ENODEV);
>  		}
>  
>  		get_device(cl->dev);
>  		cl->info = info;
>  		mutex_unlock(&registered_clients_lock);
> +		of_node_put(cln);
>  		return cl;
>  	}
>  
>  	mutex_unlock(&registered_clients_lock);
> +	of_node_put(cln);
>  
>  	return ERR_PTR(-EPROBE_DEFER);
>  }