From patchwork Tue Jun 6 09:57:06 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Su Yue X-Patchwork-Id: 9768411 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 083A660352 for ; Tue, 6 Jun 2017 09:55:31 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E021D2679B for ; Tue, 6 Jun 2017 09:55:30 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D550226E39; Tue, 6 Jun 2017 09:55:30 +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 A5FBB2841E for ; Tue, 6 Jun 2017 09:55:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751538AbdFFJzY (ORCPT ); Tue, 6 Jun 2017 05:55:24 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:31983 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1751527AbdFFJzU (ORCPT ); Tue, 6 Jun 2017 05:55:20 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="19712907" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 06 Jun 2017 17:55:11 +0800 Received: from G08CNEXCHPEKD02.g08.fujitsu.local (unknown [10.167.33.83]) by cn.fujitsu.com (Postfix) with ESMTP id 653CB47CA8D7; Tue, 6 Jun 2017 17:55:10 +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; Tue, 6 Jun 2017 17:55:09 +0800 From: Su Yue To: CC: Subject: [PATCH v3 7/9] btrfs: Check name_len before read in btrfs_get_name Date: Tue, 6 Jun 2017 17:57:06 +0800 Message-ID: <20170606095708.494-8-suy.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.13.0 In-Reply-To: <20170606095708.494-1-suy.fnst@cn.fujitsu.com> References: <20170606095708.494-1-suy.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.129] X-yoursite-MailScanner-ID: 653CB47CA8D7.ABA02 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 In 'btrfs_get_name', it does 'btrfs_search_slot' and reads name from inode_ref/root_ref. Call btrfs_is_name_len_valid in btrfs_get_name. Signed-off-by: Su Yue --- fs/btrfs/export.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/fs/btrfs/export.c b/fs/btrfs/export.c index 87144c9f9593..fa66980726c9 100644 --- a/fs/btrfs/export.c +++ b/fs/btrfs/export.c @@ -282,6 +282,11 @@ static int btrfs_get_name(struct dentry *parent, char *name, name_len = btrfs_inode_ref_name_len(leaf, iref); } + ret = btrfs_is_name_len_valid(leaf, path->slots[0], name_ptr, name_len); + if (!ret) { + btrfs_free_path(path); + return -EIO; + } read_extent_buffer(leaf, name, name_ptr, name_len); btrfs_free_path(path);