linux-kernel - Re: [PATCH] HID: Fixed a crash in hid_report_raw

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Message-ID: <alpine.LNX.2.00.1105201026300.28291@pobox.suse.cz>
Date:	Fri, 20 May 2011 10:26:36 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Armando Visconti <armando.visconti@...com>
Cc:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] HID: Fixed a crash in hid_report_raw_event() function.

On Thu, 19 May 2011, Armando Visconti wrote:

> I'm using a Data Modul EasyTouch USB multitouch controller,
> which is issuing a hid report with a size equals to 0. The rsize
> value gets set to 536870912 and Linux is crashing in the memset
> because the value is too big.
> 
> Signed-off-by: Armando Visconti <armando.visconti@...com>
> ---
>  drivers/hid/hid-core.c |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/hid/hid-core.c b/drivers/hid/hid-core.c
> index c3d6626..3e972e3 100644
> --- a/drivers/hid/hid-core.c
> +++ b/drivers/hid/hid-core.c
> @@ -1045,6 +1045,9 @@ void hid_report_raw_event(struct hid_device *hid, int type, u8 *data, int size,
>  
>  	rsize = ((report->size - 1) >> 3) + 1;
>  
> +	if (rsize > HID_MAX_BUFFER_SIZE)
> +		rsize = HID_MAX_BUFFER_SIZE;
> +
>  	if (csize < rsize) {
>  		dbg_hid("report %d is too short, (%d < %d)\n", report->id,
>  				csize, rsize);

Applied, thank you.

-- 
Jiri Kosina
SUSE Labs
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