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=-18.8 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 282A8C433B4 for ; Mon, 5 Apr 2021 09:22:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 03BEC6124B for ; Mon, 5 Apr 2021 09:22:55 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240427AbhDEJXA (ORCPT ); Mon, 5 Apr 2021 05:23:00 -0400 Received: from mail.kernel.org ([198.145.29.99]:39780 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239792AbhDEJRn (ORCPT ); Mon, 5 Apr 2021 05:17:43 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C5080613AC; Mon, 5 Apr 2021 09:17:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617614250; bh=WL1ZxEQxzl/JQBs3FER3IAxgsvUr28RtXr896Fwniew=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=rYrNYnjbdNx8MQk+W0Gf6jTy4JBtb6hYIZecdiFDkEjfNAWcEpnL/Bd2g7nH4/vjV la1sPqXAXP3RcQ5e0Bdz3aRZgFHBaHi5qCPIgbe9i46kYEkIBjjcyfkQch4WmVBad9 UB2DkxwWiGfQZpD9Jwx86MfX6L8C1TQtyqmX3x5M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexey Khoroshilov , Oliver Neukum , Johan Hovold Subject: [PATCH 5.11 138/152] USB: cdc-acm: fix use-after-free after probe failure Date: Mon, 5 Apr 2021 10:54:47 +0200 Message-Id: <20210405085038.701140984@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210405085034.233917714@linuxfoundation.org> References: <20210405085034.233917714@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: Johan Hovold commit 4e49bf376c0451ad2eae2592e093659cde12be9a upstream. 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 Link: https://lore.kernel.org/r/20210322155318.9837-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-acm.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/drivers/usb/class/cdc-acm.c +++ b/drivers/usb/class/cdc-acm.c @@ -1516,6 +1516,11 @@ skip_countries: 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);