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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2D743C433EF for ; Tue, 7 Jun 2022 19:11:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1350546AbiFGTLa (ORCPT ); Tue, 7 Jun 2022 15:11:30 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49652 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354879AbiFGTJQ (ORCPT ); Tue, 7 Jun 2022 15:09:16 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 141A3192C5D; Tue, 7 Jun 2022 11:06:27 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id A2F51617A7; Tue, 7 Jun 2022 18:06:26 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AECDEC385A5; Tue, 7 Jun 2022 18:06:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1654625186; bh=vcUCmQfmB8i+r9RY4X/Iya9RAP/6ZqDRhwhTLZlQgEU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2EaSMVjOKsy3Sm1wC8unp8rLvgCVADnDY1iP84z5W7EYYTZfa1GoFDrX6QU1MEzDi nSgHtd+NXiex95Jzocc80k6XQ3yGimwdVARvkg4tTcr8IpoQZ0I4EDSGOvNzB5ygaz 2f2raqMtkTrm+EEAo1BOJcAdPHpzB3YnAja5rF3k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Xiaomeng Tong , Song Liu Subject: [PATCH 5.15 596/667] md: fix an incorrect NULL check in md_reload_sb Date: Tue, 7 Jun 2022 19:04:21 +0200 Message-Id: <20220607164952.556841585@linuxfoundation.org> X-Mailer: git-send-email 2.36.1 In-Reply-To: <20220607164934.766888869@linuxfoundation.org> References: <20220607164934.766888869@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: Xiaomeng Tong commit 64c54d9244a4efe9bc6e9c98e13c4bbb8bb39083 upstream. The bug is here: if (!rdev || rdev->desc_nr != nr) { The list iterator value 'rdev' will *always* be set and non-NULL by rdev_for_each_rcu(), so it is incorrect to assume that the iterator value will be NULL if the list is empty or no element found (In fact, it will be a bogus pointer to an invalid struct object containing the HEAD). Otherwise it will bypass the check and lead to invalid memory access passing the check. To fix the bug, use a new variable 'iter' as the list iterator, while using the original variable 'pdev' as a dedicated pointer to point to the found element. Cc: stable@vger.kernel.org Fixes: 70bcecdb1534 ("md-cluster: Improve md_reload_sb to be less error prone") Signed-off-by: Xiaomeng Tong Signed-off-by: Song Liu Signed-off-by: Greg Kroah-Hartman --- drivers/md/md.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -9774,16 +9774,18 @@ static int read_rdev(struct mddev *mddev void md_reload_sb(struct mddev *mddev, int nr) { - struct md_rdev *rdev; + struct md_rdev *rdev = NULL, *iter; int err; /* Find the rdev */ - rdev_for_each_rcu(rdev, mddev) { - if (rdev->desc_nr == nr) + rdev_for_each_rcu(iter, mddev) { + if (iter->desc_nr == nr) { + rdev = iter; break; + } } - if (!rdev || rdev->desc_nr != nr) { + if (!rdev) { pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); return; }