linux-kernel - Re: [PATCH v2 1/4] HID: i2c-hid: fix memory corruption due to missing hid declaration

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Message-ID: <alpine.LNX.2.00.1212061054270.28002@pobox.suse.cz>
Date:	Thu, 6 Dec 2012 10:54:34 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	linux-input@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/4] HID: i2c-hid: fix memory corruption due to missing
 hid declaration

On Wed, 5 Dec 2012, Jean Delvare wrote:

> > HID descriptors contains 4 bytes of reserved field.
> > The previous implementation was overriding the next fields in struct i2c_hid.
> > 
> > Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...il.com>
> > ---
> >  drivers/hid/i2c-hid/i2c-hid.c | 9 ++++++++-
> >  1 file changed, 8 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/hid/i2c-hid/i2c-hid.c b/drivers/hid/i2c-hid/i2c-hid.c
> > index 7062df2..34cca42 100644
> > --- a/drivers/hid/i2c-hid/i2c-hid.c
> > +++ b/drivers/hid/i2c-hid/i2c-hid.c
> > @@ -69,6 +69,7 @@ struct i2c_hid_desc {
> >  	__le16 wVendorID;
> >  	__le16 wProductID;
> >  	__le16 wVersionID;
> > +	__le32 reserved;
> >  } __packed;
> >  
> >  struct i2c_hid_cmd {
> > @@ -776,7 +777,13 @@ static int __devinit i2c_hid_fetch_hid_descriptor(struct i2c_hid *ihid)
> >  	}
> >  
> >  	dsize = le16_to_cpu(hdesc->wHIDDescLength);
> > -	if (!dsize || dsize > HID_MAX_DESCRIPTOR_SIZE) {
> > +	/*
> > +	 * the size of the HID descriptor should at least contain
> > +	 * its size and the bcdVersion (4 bytes), and should not be greater
> > +	 * than sizeof(struct i2c_hid_desc) as we directly fill this struct
> > +	 * through i2c_hid_command.
> > +	 */
> > +	if (dsize < 4 || dsize > sizeof(struct i2c_hid_desc)) {
> >  		dev_err(&client->dev, "weird size of HID descriptor (%u)\n",
> >  			dsize);
> >  		return -ENODEV;
> 
> Reviewed-by: Jean Delvare <khali@...ux-fr.org>

Applied, thanks.

-- 
Jiri Kosina
SUSE Labs
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