From patchwork Wed May 12 14:43:15 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 436805 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 715D7C433B4 for ; Wed, 12 May 2021 16:01:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3285361CD4 for ; Wed, 12 May 2021 16:01:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235887AbhELQB0 (ORCPT ); Wed, 12 May 2021 12:01:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:37076 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237953AbhELP44 (ORCPT ); Wed, 12 May 2021 11:56:56 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C8B4261C1D; Wed, 12 May 2021 15:29:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1620833356; bh=B4APKrOqsAM9U0/vz34PLAMlzKTDs6SABiAri1nNwaA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=avtGzJVPU+9mWVbIXU6LfOcuyBaCLA7rblaCKmt6d0yFPjwSw6cgkt8Mc6rgXU4zK dr2/iqBuCIYLL4jNukHDjXwVJKNCAmcgtCbtpgs+IugG7XxM+lXvdvUaoKz6rM+f8U xu5Wj/fpugcgG/QcAtGGxR/dCGL8Fof2bDmk0Ql8= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Dan Carpenter , Miklos Szeredi Subject: [PATCH 5.11 118/601] ovl: fix missing revert_creds() on error path Date: Wed, 12 May 2021 16:43:15 +0200 Message-Id: <20210512144831.719905285@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210512144827.811958675@linuxfoundation.org> References: <20210512144827.811958675@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 @@ -932,7 +932,7 @@ 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); /* @@ -943,6 +943,7 @@ 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;