From patchwork Wed May 12 14:43:37 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 437062 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=-19.4 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, 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 7F263C43617 for ; Wed, 12 May 2021 15:20:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 4412561C85 for ; Wed, 12 May 2021 15:20:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233835AbhELPVD (ORCPT ); Wed, 12 May 2021 11:21:03 -0400 Received: from mail.kernel.org ([198.145.29.99]:50550 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233468AbhELPSX (ORCPT ); Wed, 12 May 2021 11:18:23 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C56BA61418; Wed, 12 May 2021 15:07:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620832057; bh=60HUpSYLIAvOm0ggHGcF6TgISfc5JxbYxCq5UeK8v7g=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=2S2bO17vF6TubPcPO1EoPYH47CJi55mdMCN9uCeetv0h0Z32WCUBb6eDDLi8Aa9IL vHbB4TJBdHTYAZFULeQm+gGVJUcf8GKQvtdeGzn+KaGGppa45J+d+Fh+29dycFEgyS EqdP3t+0e3yW+iglmLwbYTcwVSDwa1dj3Z95EYs8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Miklos Szeredi Subject: [PATCH 5.10 107/530] ovl: fix missing revert_creds() on error path Date: Wed, 12 May 2021 16:43:37 +0200 Message-Id: <20210512144823.319050573@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144819.664462530@linuxfoundation.org> References: <20210512144819.664462530@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Dan Carpenter commit 7b279bbfd2b230c7a210ff8f405799c7e46bbf48 upstream. Smatch complains about missing that the ovl_override_creds() doesn't have a matching revert_creds() if the dentry is disconnected. Fix this by moving the ovl_override_creds() until after the disconnected check. Fixes: aa3ff3c152ff ("ovl: copy up of disconnected dentries") Signed-off-by: Dan Carpenter Signed-off-by: Miklos Szeredi Signed-off-by: Greg Kroah-Hartman --- fs/overlayfs/copy_up.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/fs/overlayfs/copy_up.c +++ b/fs/overlayfs/copy_up.c @@ -928,7 +928,7 @@ static int ovl_copy_up_one(struct dentry static int ovl_copy_up_flags(struct dentry *dentry, int flags) { int err = 0; - const struct cred *old_cred = ovl_override_creds(dentry->d_sb); + const struct cred *old_cred; bool disconnected = (dentry->d_flags & DCACHE_DISCONNECTED); /* @@ -939,6 +939,7 @@ static int ovl_copy_up_flags(struct dent if (WARN_ON(disconnected && d_is_dir(dentry))) return -EIO; + old_cred = ovl_override_creds(dentry->d_sb); while (!err) { struct dentry *next; struct dentry *parent = NULL;