linux-kernel - Re: [PATCH] HID: hid-logitech-hidpp: add NULL check on devm

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Date:   Wed, 12 Jul 2017 09:40:35 +0200
From:   Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:     "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Cc:     Jiri Kosina <jikos@...nel.org>, linux-input@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: hid-logitech-hidpp: add NULL check on
 devm_kmemdup() return value

On Jul 07 2017 or thereabouts, Gustavo A. R. Silva wrote:
> Check return value from call to devm_kmemdup()
> in order to prevent a NULL pointer dereference.
> 
> Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
> ---

Reviewed-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>

>  drivers/hid/hid-logitech-hidpp.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/hid/hid-logitech-hidpp.c b/drivers/hid/hid-logitech-hidpp.c
> index 41b3946..501e16a 100644
> --- a/drivers/hid/hid-logitech-hidpp.c
> +++ b/drivers/hid/hid-logitech-hidpp.c
> @@ -2732,6 +2732,9 @@ static int hidpp_initialize_battery(struct hidpp_device *hidpp)
>  				     hidpp_battery_props,
>  				     sizeof(hidpp_battery_props),
>  				     GFP_KERNEL);
> +	if (!battery_props)
> +		return -ENOMEM;
> +
>  	num_battery_props = ARRAY_SIZE(hidpp_battery_props) - 2;
>  
>  	if (hidpp->capabilities & HIDPP_CAPABILITY_BATTERY_MILEAGE)
> -- 
> 2.5.0
>