From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757345Ab1KJFZs (ORCPT ); Thu, 10 Nov 2011 00:25:48 -0500 Received: from cantor2.suse.de ([195.135.220.15]:41770 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933946Ab1KJDVn (ORCPT ); Wed, 9 Nov 2011 22:21:43 -0500 X-Mailbox-Line: From gregkh@clark.kroah.org Wed Nov 9 13:27:04 2011 Message-Id: <20111109212704.840788762@clark.kroah.org> User-Agent: quilt/0.48-16.4 Date: Wed, 09 Nov 2011 13:26:07 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Alan Stern , Matthias Dellweg <2500@gmx.de> Subject: [045/262] usb/core/devio.c: Check for printer class specific request In-Reply-To: <20111109212847.GA20838@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 3.0-stable review patch. If anyone has any objections, please let me know. ------------------ From: Matthias Dellweg <2500@gmx.de> commit 393cbb5151ecda9f9e14e3082d048dd27a1ff9f6 upstream. In the usb printer class specific request get_device_id the value of wIndex is (interface << 8 | altsetting) instead of just interface. This enables the detection of some printers with libusb. Acked-by: Alan Stern Signed-off-by: Matthias Dellweg <2500@gmx.de> Signed-off-by: Greg Kroah-Hartman --- drivers/usb/core/devio.c | 21 ++++++++++++++++++--- 1 file changed, 18 insertions(+), 3 deletions(-) --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -607,9 +607,10 @@ static int findintfep(struct usb_device } static int check_ctrlrecip(struct dev_state *ps, unsigned int requesttype, - unsigned int index) + unsigned int request, unsigned int index) { int ret = 0; + struct usb_host_interface *alt_setting; if (ps->dev->state != USB_STATE_UNAUTHENTICATED && ps->dev->state != USB_STATE_ADDRESS @@ -618,6 +619,19 @@ static int check_ctrlrecip(struct dev_st if (USB_TYPE_VENDOR == (USB_TYPE_MASK & requesttype)) return 0; + /* + * check for the special corner case 'get_device_id' in the printer + * class specification, where wIndex is (interface << 8 | altsetting) + * instead of just interface + */ + if (requesttype == 0xa1 && request == 0) { + alt_setting = usb_find_alt_setting(ps->dev->actconfig, + index >> 8, index & 0xff); + if (alt_setting + && alt_setting->desc.bInterfaceClass == USB_CLASS_PRINTER) + index >>= 8; + } + index &= 0xff; switch (requesttype & USB_RECIP_MASK) { case USB_RECIP_ENDPOINT: @@ -770,7 +784,8 @@ static int proc_control(struct dev_state if (copy_from_user(&ctrl, arg, sizeof(ctrl))) return -EFAULT; - ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.wIndex); + ret = check_ctrlrecip(ps, ctrl.bRequestType, ctrl.bRequest, + ctrl.wIndex); if (ret) return ret; wLength = ctrl.wLength; /* To suppress 64k PAGE_SIZE warning */ @@ -1100,7 +1115,7 @@ static int proc_do_submiturb(struct dev_ kfree(dr); return -EINVAL; } - ret = check_ctrlrecip(ps, dr->bRequestType, + ret = check_ctrlrecip(ps, dr->bRequestType, dr->bRequest, le16_to_cpup(&dr->wIndex)); if (ret) { kfree(dr);