From patchwork Thu Jun 1 08:57:15 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Su Yue X-Patchwork-Id: 9758871 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0DB70603F7 for ; Thu, 1 Jun 2017 08:55:39 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F27C5284F8 for ; Thu, 1 Jun 2017 08:55:38 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E74C028511; Thu, 1 Jun 2017 08:55:38 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 746A4284FF for ; Thu, 1 Jun 2017 08:55:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751507AbdFAIz2 (ORCPT ); Thu, 1 Jun 2017 04:55:28 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:20770 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751093AbdFAIzZ (ORCPT ); Thu, 1 Jun 2017 04:55:25 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="19532178" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 01 Jun 2017 16:55:24 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id 61A1D47C653F; Thu, 1 Jun 2017 16:55:26 +0800 (CST) Received: from localhost.localdomain (10.167.226.129) by G08CNEXCHPEKD02.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.319.2; Thu, 1 Jun 2017 16:55:24 +0800 From: Su Yue To: CC: Subject: [PATCH v2 8/9] btrfs: Check namelen before in 'btrfs_del_root_ref' Date: Thu, 1 Jun 2017 16:57:15 +0800 Message-ID: <20170601085716.25898-9-suy.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170601085716.25898-1-suy.fnst@cn.fujitsu.com> References: <20170601085716.25898-1-suy.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.129] X-yoursite-MailScanner-ID: 61A1D47C653F.AAE68 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: suy.fnst@cn.fujitsu.com Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Call btrfs_is_namelen_valid before memcmp. Signed-off-by: Su Yue --- fs/btrfs/root-tree.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index 7d6bc308bf43..7a5450600723 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -390,6 +390,13 @@ int btrfs_del_root_ref(struct btrfs_trans_handle *trans, WARN_ON(btrfs_root_ref_dirid(leaf, ref) != dirid); WARN_ON(btrfs_root_ref_name_len(leaf, ref) != name_len); ptr = (unsigned long)(ref + 1); + ret = btrfs_is_namelen_valid(leaf, path->slots[0], ptr, + name_len); + if (!ret) { + err = -EIO; + goto out; + } + WARN_ON(memcmp_extent_buffer(leaf, name, ptr, name_len)); *sequence = btrfs_root_ref_sequence(leaf, ref);