From patchwork Mon Mar 22 15:53:12 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Johan Hovold X-Patchwork-Id: 12155197 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=-19.2 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=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 93A80C433E2 for ; Mon, 22 Mar 2021 15:53:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7CB2D6187E for ; Mon, 22 Mar 2021 15:53:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231175AbhCVPxU (ORCPT ); Mon, 22 Mar 2021 11:53:20 -0400 Received: from mail.kernel.org ([198.145.29.99]:49030 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230385AbhCVPxP (ORCPT ); Mon, 22 Mar 2021 11:53:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B48DB6199F; Mon, 22 Mar 2021 15:53:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616428394; bh=+Zhc0a9ydorofyGsDShMu+wWptgazNqMAEcHASrxkjc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AIFuHItZDUfQfbKDQN0PRbJrOiU/izGVQyMW3LpNgkvvtshaovfwv33tg3BwpfuTY OEpk/hDoS/JJh0jOMRzOANFWMyREMG2UqJHlsO2pRphqog5C6SqObl9YQPJz5tNwxp SikATzOhA+kTjvX2HS2yyoKXk6uQH1OHEq2IwRb6TG1PvbbO5eXEnGMe+j+TtTuSHA j7E77jKrSm4oYG232aP0p+XwnXhwvNKgThNICffP/lpxv//wvHJENs6cK2oABfTFSf CJWlNkE/wxa1TCCr0G0mfnx8KmlvmDuzwEbZmFp40Dm/fkqEa3t7UfpavJzknnjd7D X41gUPuFyA7PQ== Received: from johan by xi.lan with local (Exim 4.93.0.4) (envelope-from ) id 1lOMs0-0002Za-Lk; Mon, 22 Mar 2021 16:53:32 +0100 From: Johan Hovold To: Oliver Neukum , Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, Johan Hovold , stable@vger.kernel.org, Alexey Khoroshilov Subject: [PATCH v2 2/8] USB: cdc-acm: fix use-after-free after probe failure Date: Mon, 22 Mar 2021 16:53:12 +0100 Message-Id: <20210322155318.9837-3-johan@kernel.org> X-Mailer: git-send-email 2.26.3 In-Reply-To: <20210322155318.9837-1-johan@kernel.org> References: <20210322155318.9837-1-johan@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org If tty-device registration fails the driver would fail to release the data interface. When the device is later disconnected, the disconnect callback would still be called for the data interface and would go about releasing already freed resources. Fixes: c93d81955005 ("usb: cdc-acm: fix error handling in acm_probe()") Cc: stable@vger.kernel.org # 3.9 Cc: Alexey Khoroshilov Acked-by: Oliver Neukum Signed-off-by: Johan Hovold --- drivers/usb/class/cdc-acm.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/usb/class/cdc-acm.c b/drivers/usb/class/cdc-acm.c index d75a78ad464d..dfc2480add91 100644 --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1503,6 +1503,11 @@ static int acm_probe(struct usb_interface *intf, return 0; alloc_fail6: + if (!acm->combined_interfaces) { + /* Clear driver data so that disconnect() returns early. */ + usb_set_intfdata(data_interface, NULL); + usb_driver_release_interface(&acm_driver, data_interface); + } if (acm->country_codes) { device_remove_file(&acm->control->dev, &dev_attr_wCountryCodes);