linux-kernel - [ 08/46] usbfs: Always allow ctrl requests with USB_RECIP

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Message-Id: <20130506225821.566570483@linuxfoundation.org>
Date:	Mon,  6 May 2013 15:58:14 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Dave Stikkolorum <d.r.stikkolorum@....nl>,
	Hans de Goede <hdegoede@...hat.com>,
	Alan Stern <stern@...land.harvard.edu>
Subject: [ 08/46] usbfs: Always allow ctrl requests with USB_RECIP_ENDPOINT on the ctrl ep

3.0-stable review patch.  If anyone has any objections, please let me know.

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

From: Hans de Goede <hdegoede@...hat.com>

commit 1361bf4b9f9ef45e628a5b89e0fd9bedfdcb7104 upstream.

When usbfs receives a ctrl-request from userspace it calls check_ctrlrecip,
which for a request with USB_RECIP_ENDPOINT tries to map this to an interface
to see if this interface is claimed, except for ctrl-requests with a type of
USB_TYPE_VENDOR.

When trying to use this device: http://www.akaipro.com/eiepro
redirected to a Windows vm running on qemu on top of Linux.

The windows driver makes a ctrl-req with USB_TYPE_CLASS and
USB_RECIP_ENDPOINT with index 0, and the mapping of the endpoint (0) to
the interface fails since ep 0 is the ctrl endpoint and thus never is
part of an interface.

This patch fixes this ctrl-req failing by skipping the checkintf call for
USB_RECIP_ENDPOINT ctrl-reqs on the ctrl endpoint.

Reported-by: Dave Stikkolorum <d.r.stikkolorum@....nl>
Tested-by: Dave Stikkolorum <d.r.stikkolorum@....nl>
Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/usb/core/devio.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/drivers/usb/core/devio.c
+++ b/drivers/usb/core/devio.c
@@ -642,6 +642,8 @@ static int check_ctrlrecip(struct dev_st
 	index &= 0xff;
 	switch (requesttype & USB_RECIP_MASK) {
 	case USB_RECIP_ENDPOINT:
+		if ((index & ~USB_DIR_IN) == 0)
+			return 0;
 		ret = findintfep(ps->dev, index);
 		if (ret >= 0)
 			ret = checkintf(ps, ret);

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