linux-kernel - Re: [PATCH 2/2] HID: picolcd: sanity check report size in raw

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Date:	Wed, 27 Aug 2014 10:13:11 +0200
From:	Bruno Prémont <bonbons@...ux-vserver.org>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] HID: picolcd: sanity check report size in
 raw_event() callback

On Wed, 27 Aug 2014 09:13:15 +0200 (CEST) Jiri Kosina wrote:
> The report passed to us from transport driver could potentially be 
> arbitrarily large, therefore we better sanity-check it so that raw_data 
> that we hold in picolcd_pending structure are always kept within proper 
> bounds.
> 
> Cc: stable@...r.kernel.org
> Reported-by: Steven Vittitoe <scvitti@...gle.com>
> Signed-off-by: Jiri Kosina <jkosina@...e.cz>

Acked-by: Bruno Prémont <bonbons@...ux-vserver.org>

> ---
>  drivers/hid/hid-picolcd_core.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c
> index acbb0210..020df3c 100644
> --- a/drivers/hid/hid-picolcd_core.c
> +++ b/drivers/hid/hid-picolcd_core.c
> @@ -350,6 +350,12 @@ static int picolcd_raw_event(struct hid_device *hdev,
>  	if (!data)
>  		return 1;
>  
> +	if (size > 64) {
> +		hid_warn(hdev, "invalid size value (%d) for picolcd raw event\n",
> +				size);

Is it worth adding report->id to this hid_warn()?

A valid device is not expected to ever send >64 bytes reports but in
case a firmware update would do so it would help to know for which
report it was.

> +		return 0;
> +	}
> +
>  	if (report->id == REPORT_KEY_STATE) {
>  		if (data->input_keys)
>  			ret = picolcd_raw_keypad(data, report, raw_data+1, size-1);
--
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