From mboxrd@z Thu Jan 1 00:00:00 1970 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=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 87A64C4338F for ; Tue, 27 Jul 2021 13:20:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6A3286187F for ; Tue, 27 Jul 2021 13:20:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236913AbhG0NUV (ORCPT ); Tue, 27 Jul 2021 09:20:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:56478 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236741AbhG0NTv (ORCPT ); Tue, 27 Jul 2021 09:19:51 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7E95C61A8C; Tue, 27 Jul 2021 13:19:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1627391957; bh=udT0J8LbuFSyRMXl5YH7r4HlqXhQ2HNqHnm2/jMlvEw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=L0kXNjGxXP0sFs/nxbbkbuFjkzLBsAJ09TTe0sLBeept+yL6FhXkUspd/vhUlwk6t ivkM1j6J7xLiD+DELYR022hypdEcJHLhmSh68mVLCybwuyHORf0fcyo4HLxrsCNIkv KOUkMuSqSkax+OcY1ERNEc74IPALi9gjxnoVILPsXxjOtDHKw4KJZIpWp0gDFsfIiw wkbB19JCQ091BSkEKIr/esrSedaz/5Yqg5unKAgF4uMWKSLtWs2v+cf7oTBSd3n3X8 dgDPOeEykrClXkXlxGk7wsRhAqyEJEjTiGgSNL5lPMxWqniX6s4crRaor29PmrQRO2 +TgrxdxbstN5A== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Alan Stern , syzbot+72af3105289dcb4c055b@syzkaller.appspotmail.com, Greg Kroah-Hartman , Sasha Levin , linux-usb@vger.kernel.org Subject: [PATCH AUTOSEL 5.13 06/21] USB: core: Fix incorrect pipe calculation in do_proc_control() Date: Tue, 27 Jul 2021 09:18:53 -0400 Message-Id: <20210727131908.834086-6-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210727131908.834086-1-sashal@kernel.org> References: <20210727131908.834086-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alan Stern [ Upstream commit b0863f1927323110e3d0d69f6adb6a91018a9a3c ] When the user submits a control URB via usbfs, the user supplies the bRequestType value and the kernel uses it to compute the pipe value. However, do_proc_control() performs this computation incorrectly in the case where the bRequestType direction bit is set to USB_DIR_IN and the URB's transfer length is 0: The pipe's direction is also set to IN but it should be OUT, which is the direction the actual transfer will use regardless of bRequestType. Commit 5cc59c418fde ("USB: core: WARN if pipe direction != setup packet direction") added a check to compare the direction bit in the pipe value to a control URB's actual direction and to WARN if they are different. This can be triggered by the incorrect computation mentioned above, as found by syzbot. This patch fixes the computation, thus avoiding the WARNing. Reported-and-tested-by: syzbot+72af3105289dcb4c055b@syzkaller.appspotmail.com Signed-off-by: Alan Stern Link: https://lore.kernel.org/r/20210712185436.GB326369@rowland.harvard.edu Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin --- drivers/usb/core/devio.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 2218941d35a3..73b60f013b20 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -1133,7 +1133,7 @@ static int do_proc_control(struct usb_dev_state *ps, "wIndex=%04x wLength=%04x\n", ctrl->bRequestType, ctrl->bRequest, ctrl->wValue, ctrl->wIndex, ctrl->wLength); - if (ctrl->bRequestType & 0x80) { + if ((ctrl->bRequestType & USB_DIR_IN) && ctrl->wLength) { pipe = usb_rcvctrlpipe(dev, 0); snoop_urb(dev, NULL, pipe, ctrl->wLength, tmo, SUBMIT, NULL, 0); -- 2.30.2