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=-19.1 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=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 78DE0C433ED for ; Mon, 17 May 2021 14:36:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5FCFC6192D for ; Mon, 17 May 2021 14:36:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237599AbhEQOhb (ORCPT ); Mon, 17 May 2021 10:37:31 -0400 Received: from mail.kernel.org ([198.145.29.99]:43232 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239420AbhEQOdk (ORCPT ); Mon, 17 May 2021 10:33:40 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 3E4B461405; Mon, 17 May 2021 14:16:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621260974; bh=zD/XlO3nFglcr4ayUhe59PHYI1gbpAn+M8Dg02aSF6A=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OsXRjG5qdhIAUC7zq7OH8OhS2OM6cwSndbkUvKucCy4wq+az/+OSU22rgp7KpVeqD Dh+W++eQFfvoa63oqFnpZSwt2Rm4Zi55O70a92nsgrXi4bv4FQ9YqsyY2ybNTweHJ8 m+BcBCvQqpxK7QSalHkNSD+/C+7pQgrPu+R9LY/s= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Alexander Aring , David Teigland , Sasha Levin Subject: [PATCH 5.11 019/329] fs: dlm: check on minimum msglen size Date: Mon, 17 May 2021 15:58:50 +0200 Message-Id: <20210517140302.702411095@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140302.043055203@linuxfoundation.org> References: <20210517140302.043055203@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Alexander Aring [ Upstream commit 710176e8363f269c6ecd73d203973b31ace119d3 ] This patch adds an additional check for minimum dlm header size which is an invalid dlm message and signals a broken stream. A msglen field cannot be less than the dlm header size because the field is inclusive header lengths. Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin --- fs/dlm/midcomms.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/fs/dlm/midcomms.c b/fs/dlm/midcomms.c index fde3a6afe4be..0bedfa8606a2 100644 --- a/fs/dlm/midcomms.c +++ b/fs/dlm/midcomms.c @@ -49,9 +49,10 @@ int dlm_process_incoming_buffer(int nodeid, unsigned char *buf, int len) * cannot deliver this message to upper layers */ msglen = get_unaligned_le16(&hd->h_length); - if (msglen > DEFAULT_BUFFER_SIZE) { - log_print("received invalid length header: %u, will abort message parsing", - msglen); + if (msglen > DEFAULT_BUFFER_SIZE || + msglen < sizeof(struct dlm_header)) { + log_print("received invalid length header: %u from node %d, will abort message parsing", + msglen, nodeid); return -EBADMSG; } -- 2.30.2