[PATCH] Input: gpio_keys_polled - fix DT node reference leak

[PATCH] Input: gpio_keys_polled - fix DT node reference leak

[Dmitry Torokhov]

When someone requests button with wakeup (which this driver does not
support) we should drop reference to the current child device node before
returning error.

Note that when we using legacy platform data 'child' stays NULL which
fwnode_handle_put() handles just fine.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---
 drivers/input/keyboard/gpio_keys_polled.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
index 270dcf7..72b3503 100644
--- a/drivers/input/keyboard/gpio_keys_polled.c
+++ b/drivers/input/keyboard/gpio_keys_polled.c
@@ -291,6 +291,7 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
 
 		if (button->wakeup) {
 			dev_err(dev, DRV_NAME " does not support wakeup\n");
+			fwnode_handle_put(child);
 			return -EINVAL;
 		}
 
-- 
2.8.0.rc3.226.g39d4020


-- 
Dmitry

Re: [PATCH] Input: gpio_keys_polled - fix DT node reference leak

[Mika Westerberg]

On Thu, Oct 20, 2016 at 03:06:36PM -0700, Dmitry Torokhov wrote:
> When someone requests button with wakeup (which this driver does not
> support) we should drop reference to the current child device node before
> returning error.
> 
> Note that when we using legacy platform data 'child' stays NULL which
> fwnode_handle_put() handles just fine.
> 
> Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> ---
>  drivers/input/keyboard/gpio_keys_polled.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
> index 270dcf7..72b3503 100644
> --- a/drivers/input/keyboard/gpio_keys_polled.c
> +++ b/drivers/input/keyboard/gpio_keys_polled.c
> @@ -291,6 +291,7 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
>  
>  		if (button->wakeup) {
>  			dev_err(dev, DRV_NAME " does not support wakeup\n");
> +			fwnode_handle_put(child);

Are you sure this is the right place?

I didn't try to compile this but to me it looks like there is no
variable named "child" in the whole gpio_keys_polled_probe() function.
Unless I'm looking at wrong branch ;-)

>  			return -EINVAL;
>  		}
>  
> -- 
> 2.8.0.rc3.226.g39d4020
> 
> 
> -- 
> Dmitry

Re: [PATCH] Input: gpio_keys_polled - fix DT node reference leak

[Dmitry Torokhov]

On Fri, Oct 21, 2016 at 12:02:35PM +0300, Mika Westerberg wrote:
> On Thu, Oct 20, 2016 at 03:06:36PM -0700, Dmitry Torokhov wrote:
> > When someone requests button with wakeup (which this driver does not
> > support) we should drop reference to the current child device node before
> > returning error.
> > 
> > Note that when we using legacy platform data 'child' stays NULL which
> > fwnode_handle_put() handles just fine.
> > 
> > Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
> > ---
> >  drivers/input/keyboard/gpio_keys_polled.c | 1 +
> >  1 file changed, 1 insertion(+)
> > 
> > diff --git a/drivers/input/keyboard/gpio_keys_polled.c b/drivers/input/keyboard/gpio_keys_polled.c
> > index 270dcf7..72b3503 100644
> > --- a/drivers/input/keyboard/gpio_keys_polled.c
> > +++ b/drivers/input/keyboard/gpio_keys_polled.c
> > @@ -291,6 +291,7 @@ static int gpio_keys_polled_probe(struct platform_device *pdev)
> >  
> >  		if (button->wakeup) {
> >  			dev_err(dev, DRV_NAME " does not support wakeup\n");
> > +			fwnode_handle_put(child);
> 
> Are you sure this is the right place?
> 
> I didn't try to compile this but to me it looks like there is no
> variable named "child" in the whole gpio_keys_polled_probe() function.
> Unless I'm looking at wrong branch ;-)

Hmm, it was on top of my other change. I though I already published it,
but since it turns out I didn't I will just fold this one in.

Thanks.

-- 
Dmitry