linux-kernel - [112/146] usb: gadget: rndis: dont test against req->length

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Message-Id: <20110601080421.664816564@blue.kroah.org>
Date:	Wed, 01 Jun 2011 17:00:48 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [112/146] usb: gadget: rndis: dont test against req->length

2.6.38-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Felipe Balbi <balbi@...com>

commit 472b91274a6c6857877b5caddb875dcb5ecdfcb8 upstream.

composite.c always sets req->length to zero
and expects function driver's setup handlers
to return the amount of bytes to be used
on req->length. If we test against req->length
w_length will always be greater than req->length
thus making us always stall that particular
SEND_ENCAPSULATED_COMMAND request.

Tested against a Windows XP SP3.

Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/usb/gadget/f_rndis.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/usb/gadget/f_rndis.c
+++ b/drivers/usb/gadget/f_rndis.c
@@ -420,8 +420,7 @@ rndis_setup(struct usb_function *f, cons
 	 */
 	case ((USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE) << 8)
 			| USB_CDC_SEND_ENCAPSULATED_COMMAND:
-		if (w_length > req->length || w_value
-				|| w_index != rndis->ctrl_id)
+		if (w_value || w_index != rndis->ctrl_id)
 			goto invalid;
 		/* read the request; process it later */
 		value = w_length;


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