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=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 9A48AC433ED for ; Mon, 5 Apr 2021 08:56:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7178A6139D for ; Mon, 5 Apr 2021 08:56:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232494AbhDEI4G (ORCPT ); Mon, 5 Apr 2021 04:56:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:34402 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232792AbhDEI4G (ORCPT ); Mon, 5 Apr 2021 04:56:06 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D3FA8610E8; Mon, 5 Apr 2021 08:55:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1617612960; bh=MwKQX6/m/6IRBUe7GiUOhXLiIEKit0me7CMYuXG4Kl4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fjx3ID8mgSfiJVGeplnsNXTIPl+eUxuj2AzB6wLOdZQgDob2ONr/I2D/MOjz9K2Hb /spQS1Ly9kXuDtXzLgflejpHKaPFAdc/5S0HIUcOFQ2mW0gB1lH9gEn2G21h15G+Im VJUiAbD+Mtat6SbP//s1ltE7Ho7etqrVkPJJMINk= 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 4.4 26/28] USB: cdc-acm: fix use-after-free after probe failure Date: Mon, 5 Apr 2021 10:54:00 +0200 Message-Id: <20210405085017.845889511@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210405085017.012074144@linuxfoundation.org> References: <20210405085017.012074144@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: stable@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 @@ -1502,6 +1502,11 @@ skip_countries: return 0; alloc_fail8: + 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);