linux-kernel - Re: [PATCH] HID: input: Fix NULL pointer dereference when power_supply

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Date:	Tue, 24 Mar 2015 12:02:41 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Krzysztof Kozlowski <k.kozlowski@...sung.com>
cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, Sebastian Reichel <sre@...nel.org>,
	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	David Woodhouse <dwmw2@...radead.org>,
	Dan Carpenter <dan.carpenter@...cle.com>
Subject: Re: [PATCH] HID: input: Fix NULL pointer dereference when
 power_supply_register fails

On Mon, 23 Mar 2015, Krzysztof Kozlowski wrote:

> Do not call power_supply_powers() if power_supply_register() failed
> earlier. This fixes possible NULL pointer dereference by
> power_supply_powers() in such case.
> 
> Signed-off-by: Krzysztof Kozlowski <k.kozlowski@...sung.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> 
> ---
> 
> The patch was prepared on top of next-20150323. It depends on changes in
> power supply core (battery-2.6.git) so probably it should be applied to
> the battery tree.

Acked-by: Jiri Kosina <jkosina@...e.cz>

for the merge through battery-2.6.git. Thanks.

> ---
>  drivers/hid/hid-input.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/hid/hid-input.c b/drivers/hid/hid-input.c
> index a70fa4d7f8f9..008e89bf6f3c 100644
> --- a/drivers/hid/hid-input.c
> +++ b/drivers/hid/hid-input.c
> @@ -452,10 +452,10 @@ static bool hidinput_setup_battery(struct hid_device *dev, unsigned report_type,
>  		kfree(psy_desc->name);
>  		kfree(psy_desc);
>  		dev->battery = NULL;
> +	} else {
> +		power_supply_powers(dev->battery, &dev->dev);
>  	}
>  
> -	power_supply_powers(dev->battery, &dev->dev);
> -
>  out:
>  	return true;
>  }

-- 
Jiri Kosina
SUSE Labs
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