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=-18.7 required=3.0 tests=BAYES_00,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_RED, 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 AA136C43381 for ; Mon, 28 Dec 2020 14:32:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7D365207B2 for ; Mon, 28 Dec 2020 14:32:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2504790AbgL1Oco (ORCPT ); Mon, 28 Dec 2020 09:32:44 -0500 Received: from mail.kernel.org ([198.145.29.99]:39864 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392101AbgL1Obw (ORCPT ); Mon, 28 Dec 2020 09:31:52 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 4620920791; Mon, 28 Dec 2020 14:31:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1609165896; bh=WmPOZiA28eMxsh5USZaoHVnbE4Q8/E4DuTNXX/FnMBw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=SFcHHnFSqI5+OEse81ieiDahq6XGjyuqqfkGGEYdR08w9RfgFPHsDkg0xSYSD1Bos GliyGoyqyQPijwa+p+YbtuWnZcPcntwKX+GPtMizIYEOGydsng1PGal2MvvDAgxWfK qJJQYNgtBjOt6d7VjkLW/J3WH/viqVCJzMgBlvKc= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Rafael J. Wysocki" , Takashi Iwai , Saravana Kannan Subject: [PATCH 5.10 694/717] driver: core: Fix list corruption after device_del() Date: Mon, 28 Dec 2020 13:51:32 +0100 Message-Id: <20201228125054.232036599@linuxfoundation.org> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20201228125020.963311703@linuxfoundation.org> References: <20201228125020.963311703@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: Takashi Iwai commit 66482f640755b31cb94371ff6cef17400cda6db5 upstream. The device_links_purge() function (called from device_del()) tries to remove the links.needs_suppliers list entry, but it's using list_del(), hence it doesn't initialize after the removal. This is OK for normal cases where device_del() is called via device_destroy(). However, it's not guaranteed that the device object will be really deleted soon after device_del(). In a minor case like HD-audio codec reconfiguration that re-initializes the device after device_del(), it may lead to a crash by the corrupted list entry. As a simple fix, replace list_del() with list_del_init() in order to make the list intact after the device_del() call. Fixes: e2ae9bcc4aaa ("driver core: Add support for linking devices during device addition") Cc: Reviewed-by: Rafael J. Wysocki Signed-off-by: Takashi Iwai Link: https://lore.kernel.org/r/20201208190326.27531-1-tiwai@suse.de Cc: Saravana Kannan Signed-off-by: Greg Kroah-Hartman --- drivers/base/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/base/core.c +++ b/drivers/base/core.c @@ -1386,7 +1386,7 @@ static void device_links_purge(struct de return; mutex_lock(&wfs_lock); - list_del(&dev->links.needs_suppliers); + list_del_init(&dev->links.needs_suppliers); mutex_unlock(&wfs_lock); /*