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=-19.3 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, 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 1E7A5C433DB for ; Mon, 8 Feb 2021 15:51:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B55B764E85 for ; Mon, 8 Feb 2021 15:51:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234098AbhBHPva (ORCPT ); Mon, 8 Feb 2021 10:51:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:52066 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232066AbhBHPHP (ORCPT ); Mon, 8 Feb 2021 10:07:15 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 1EF2464EBF; Mon, 8 Feb 2021 15:05:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1612796737; bh=GKITYz5xisbQHlg5N2WH7Loow+BaDEjuJ9GMbpCFAGA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qdmFYHkt6QsvCj5CpprTLgaHEYcxtZoRwlBqte+MunjGdtZBIdC9fLflF55Agujud UIcFRLT3mhCColk09uMyGyeT/3MB9Tk5zgX6XYFvEAmZTNIRwLI1GNKao73ONwjgHx 9qOoDcm6UuFxpIt3yEYFwfaU3oxzr+vbfsp/9TrY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Gerhard Klostermeier , Heiko Stuebner Subject: [PATCH 4.9 27/43] usb: dwc2: Fix endpoint direction check in ep_from_windex Date: Mon, 8 Feb 2021 16:00:53 +0100 Message-Id: <20210208145807.413970171@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210208145806.281758651@linuxfoundation.org> References: <20210208145806.281758651@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Heiko Stuebner commit f670e9f9c8cac716c3506c6bac9e997b27ad441a upstream. dwc2_hsotg_process_req_status uses ep_from_windex() to retrieve the endpoint for the index provided in the wIndex request param. In a test-case with a rndis gadget running and sending a malformed packet to it like: dev.ctrl_transfer( 0x82, # bmRequestType 0x00, # bRequest 0x0000, # wValue 0x0001, # wIndex 0x00 # wLength ) it is possible to cause a crash: [ 217.533022] dwc2 ff300000.usb: dwc2_hsotg_process_req_status: USB_REQ_GET_STATUS [ 217.559003] Unable to handle kernel read from unreadable memory at virtual address 0000000000000088 ... [ 218.313189] Call trace: [ 218.330217] ep_from_windex+0x3c/0x54 [ 218.348565] usb_gadget_giveback_request+0x10/0x20 [ 218.368056] dwc2_hsotg_complete_request+0x144/0x184 This happens because ep_from_windex wants to compare the endpoint direction even if index_to_ep() didn't return an endpoint due to the direction not matching. The fix is easy insofar that the actual direction check is already happening when calling index_to_ep() which will return NULL if there is no endpoint for the targeted direction, so the offending check can go away completely. Fixes: c6f5c050e2a7 ("usb: dwc2: gadget: add bi-directional endpoint support") Cc: stable@vger.kernel.org Reported-by: Gerhard Klostermeier Signed-off-by: Heiko Stuebner Link: https://lore.kernel.org/r/20210127103919.58215-1-heiko@sntech.de Signed-off-by: Greg Kroah-Hartman --- drivers/usb/dwc2/gadget.c | 8 +------- 1 file changed, 1 insertion(+), 7 deletions(-) --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -942,7 +942,6 @@ static void dwc2_hsotg_complete_oursetup static struct dwc2_hsotg_ep *ep_from_windex(struct dwc2_hsotg *hsotg, u32 windex) { - struct dwc2_hsotg_ep *ep; int dir = (windex & USB_DIR_IN) ? 1 : 0; int idx = windex & 0x7F; @@ -952,12 +951,7 @@ static struct dwc2_hsotg_ep *ep_from_win if (idx > hsotg->num_of_eps) return NULL; - ep = index_to_ep(hsotg, idx, dir); - - if (idx && ep->dir_in != dir) - return NULL; - - return ep; + return index_to_ep(hsotg, idx, dir); } /**