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=-19.7 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=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 0169CC4338F for ; Tue, 17 Aug 2021 00:39:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DA1D260F58 for ; Tue, 17 Aug 2021 00:39:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237621AbhHQAjo (ORCPT ); Mon, 16 Aug 2021 20:39:44 -0400 Received: from mail.kernel.org ([198.145.29.99]:35916 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236079AbhHQAgh (ORCPT ); Mon, 16 Aug 2021 20:36:37 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id EED3F6103A; Tue, 17 Aug 2021 00:36:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1629160565; bh=kIexKIdcMTVkOlUwD4Q2wR1/p8oEvDAmKeJCf5AcyZM=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BXMH0uAS9YlgasvPJdtkH49Z5NgoJxutYtrSrt0VmAXkiJzXvkHir8605FeQzlPWg P8HbQ/LPsF8sAHqOBZhgwXb7qDrYZZplCSzdOtTA7knY7yYUehrrAHosub9y0rOkEd Y1sWUs5J+rUKsPhM9FbEqIjMKCke67tzqkahq6dIeedKdYa0r+Ss5mS8tpYG9wdUgz 6z05wN+hiO4n/VKULw2cGqnnt9i103sNWPIWxcn2psfqOuql9UsRuibQfLL3D6A8J+ O3ABIohpKnAUhZziFoF6sUgvh+IAGURJcJhGhzdhe+c+wTDdzNVI89vQBL5r9Ke2aL I0siDGXJUkxjw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Miklos Szeredi , Colin Ian King , Sasha Levin , linux-unionfs@vger.kernel.org Subject: [PATCH AUTOSEL 5.10 8/9] ovl: fix uninitialized pointer read in ovl_lookup_real_one() Date: Mon, 16 Aug 2021 20:35:53 -0400 Message-Id: <20210817003554.83213-8-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210817003554.83213-1-sashal@kernel.org> References: <20210817003554.83213-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Miklos Szeredi [ Upstream commit 580c610429b3994e8db24418927747cf28443cde ] One error path can result in release_dentry_name_snapshot() being called before "name" was initialized by take_dentry_name_snapshot(). Fix by moving the release_dentry_name_snapshot() to immediately after the only use. Reported-by: Colin Ian King Signed-off-by: Miklos Szeredi Signed-off-by: Sasha Levin --- fs/overlayfs/export.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c index ed35be3fafc6..f469982dcb36 100644 --- a/fs/overlayfs/export.c +++ b/fs/overlayfs/export.c @@ -390,6 +390,7 @@ static struct dentry *ovl_lookup_real_one(struct dentry *connected, */ take_dentry_name_snapshot(&name, real); this = lookup_one_len(name.name.name, connected, name.name.len); + release_dentry_name_snapshot(&name); err = PTR_ERR(this); if (IS_ERR(this)) { goto fail; @@ -404,7 +405,6 @@ static struct dentry *ovl_lookup_real_one(struct dentry *connected, } out: - release_dentry_name_snapshot(&name); dput(parent); inode_unlock(dir); return this; -- 2.30.2