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 4397AC43216 for ; Tue, 24 Aug 2021 16:56:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2C51B61371 for ; Tue, 24 Aug 2021 16:56:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234020AbhHXQ5I (ORCPT ); Tue, 24 Aug 2021 12:57:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:38758 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233499AbhHXQ46 (ORCPT ); Tue, 24 Aug 2021 12:56:58 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2141F61374; Tue, 24 Aug 2021 16:56:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629824173; bh=udT0J8LbuFSyRMXl5YH7r4HlqXhQ2HNqHnm2/jMlvEw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=c049xdwJUsA+DqtRrGi/5VeIHQFb/goa53m8TuDTs80Wy0WtAXg2PFHoRcuk73fRK KUrsVzn6aqcenAdeMtS/9RTxqytBZuEdebW8kCzrx3Q02P6ji4zx210niOUQyr6tcL V9vCCrKk+QB2WZQkSGpVlMrv5Szou8AnkqtIPHD5/A9PmWc/bTg3o8/DUuRyLwc92w d14YCgrnsvh/9Ha0EOMhQR/IiDhgccWvfQ3jBVgvLzpoC4+pzLzU2cJUHAk0Xbuz+s NLBpUjrbxZ7BBaiLTb6GtBDZqPzUVypgJTvkIeLJHwZiiQ9fcxF2SW+ZuNvaTwXg60 857AnF/ypiHQw== 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 Subject: [PATCH 5.13 004/127] USB: core: Fix incorrect pipe calculation in do_proc_control() Date: Tue, 24 Aug 2021 12:54:04 -0400 Message-Id: <20210824165607.709387-5-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210824165607.709387-1-sashal@kernel.org> References: <20210824165607.709387-1-sashal@kernel.org> MIME-Version: 1.0 X-KernelTest-Patch: http://kernel.org/pub/linux/kernel/v5.x/stable-review/patch-5.13.13-rc1.gz X-KernelTest-Tree: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git X-KernelTest-Branch: linux-5.13.y X-KernelTest-Patches: git://git.kernel.org/pub/scm/linux/kernel/git/stable/stable-queue.git X-KernelTest-Version: 5.13.13-rc1 X-KernelTest-Deadline: 2021-08-26T16:55+00:00 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