From patchwork Thu May 20 20:20:56 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Alan Stern X-Patchwork-Id: 12271347 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 727DAC433B4 for ; Thu, 20 May 2021 20:20:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 579FE6135A for ; Thu, 20 May 2021 20:20:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235278AbhETUWT (ORCPT ); Thu, 20 May 2021 16:22:19 -0400 Received: from netrider.rowland.org ([192.131.102.5]:58455 "HELO netrider.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S235257AbhETUWT (ORCPT ); Thu, 20 May 2021 16:22:19 -0400 Received: (qmail 1217272 invoked by uid 1000); 20 May 2021 16:20:56 -0400 Date: Thu, 20 May 2021 16:20:56 -0400 From: Alan Stern To: Greg KH Cc: "Geoffrey D. Bennett" , USB mailing list Subject: [PATCH] USB: core: WARN if pipe direction != setup packet direction Message-ID: <20210520202056.GB1216852@rowland.harvard.edu> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.10.1 (2018-07-13) Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org When a control URB is submitted, the direction indicated by URB's pipe member is supposed to match the direction indicated by the setup packet's bRequestType member. A mismatch could lead to trouble, depending on which field the host controller drivers use for determining the actual direction. This shouldn't ever happen; it would represent a careless bug in a kernel driver somewhere. This patch adds a dev_WARN to let people know about the potential problem. Suggested-by: "Geoffrey D. Bennett" Signed-off-by: Alan Stern --- [as1960] drivers/usb/core/urb.c | 3 +++ 1 file changed, 3 insertions(+) Index: usb-devel/drivers/usb/core/urb.c =================================================================== --- usb-devel.orig/drivers/usb/core/urb.c +++ usb-devel/drivers/usb/core/urb.c @@ -407,6 +407,9 @@ int usb_submit_urb(struct urb *urb, gfp_ return -ENOEXEC; is_out = !(setup->bRequestType & USB_DIR_IN) || !setup->wLength; + if (usb_pipeout(urb->pipe) != is_out) + dev_WARN(&dev->dev, "BOGUS control dir, pipe %x doesn't match bRequestType %x\n", + urb->pipe, setup->bRequestType); } else { is_out = usb_endpoint_dir_out(&ep->desc); }