From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20130518021644.328474589@goodmis.org> Date: Fri, 17 May 2013 22:16:13 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Dave Stikkolorum , Hans de Goede , Alan Stern , Greg Kroah-Hartman Subject: [ 016/136 ] usbfs: Always allow ctrl requests with USB_RECIP_ENDPOINT on the ctrl ep References: <20130518021557.139113314@goodmis.org> Content-Disposition: inline; filename=0016-usbfs-Always-allow-ctrl-requests-with-USB_RECIP_ENDP.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.6.11.4 stable review patch. If anyone has any objections, please let me know. ------------------ From: Hans de Goede [ Upstream commit 1361bf4b9f9ef45e628a5b89e0fd9bedfdcb7104 ] 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 Tested-by: Dave Stikkolorum Signed-off-by: Hans de Goede Acked-by: Alan Stern Cc: stable Signed-off-by: Greg Kroah-Hartman Signed-off-by: Steven Rostedt --- drivers/usb/core/devio.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 7f75343..570fb4a 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -738,6 +738,8 @@ static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, 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); -- 1.7.10.4