linux-kernel - Re: [PATCH 3/4] HID: logitech-hidpp: add boundary check for name retrieval

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Message-ID: <20141211152517.GE29747@mail.corp.redhat.com>
Date:	Thu, 11 Dec 2014 10:25:17 -0500
From:	Benjamin Tissoires <benjamin.tissoires@...hat.com>
To:	Peter Wu <peter@...ensteyn.nl>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Nestor Lopez Casado <nlopezcasad@...itech.com>,
	Peter Hutterer <peter.hutterer@...-t.net>,
	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] HID: logitech-hidpp: add boundary check for name
 retrieval

On Dec 11 2014 or thereabouts, Peter Wu wrote:
> The HID response has a limited size. Do not trust the value returned by
> hardware, check that it really fits in the message.
> 
> Signed-off-by: Peter Wu <peter@...ensteyn.nl>
> ---

Well spotted!

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

Cheers,
Benjamin


>  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 4d72c20..4292cc3 100644
> --- a/drivers/hid/hid-logitech-hidpp.c
> +++ b/drivers/hid/hid-logitech-hidpp.c
> @@ -313,6 +313,9 @@ static char *hidpp_get_unifying_name(struct hidpp_device *hidpp_dev)
>  
>  	len = response.rap.params[1];
>  
> +	if (2 + len > sizeof(response.rap.params))
> +		return NULL;
> +
>  	name = kzalloc(len + 1, GFP_KERNEL);
>  	if (!name)
>  		return NULL;
> -- 
> 2.1.3
> 
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