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 576D8C433B4 for ; Mon, 17 May 2021 14:05:44 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 424836135B for ; Mon, 17 May 2021 14:05:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237836AbhEQOG7 (ORCPT ); Mon, 17 May 2021 10:06:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:58350 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237771AbhEQOGZ (ORCPT ); Mon, 17 May 2021 10:06:25 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id D051061244; Mon, 17 May 2021 14:04:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621260297; bh=M5+oJRYsV3pUQaiHvw5PgbCbW1aT7Sa7iR37zhCCqJY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TdJ8Xie4BJ06Rz9ZJdfc4iXL2l3C5FsfuvByScNCCTUbiM04geWvLkehOTmGfXazt S4TX2EpH89e5SFh6QCo8rCiux36/bZsgkMV86A0YMHShlEpT/69N2BSLO2iWk66D/9 tsFBvfNCEOswN+YJjYMeEB3rOm41ynW87zfSg1kY= 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 5.12 018/363] fs: dlm: change allocation limits Date: Mon, 17 May 2021 15:58:04 +0200 Message-Id: <20210517140303.199060035@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210517140302.508966430@linuxfoundation.org> References: <20210517140302.508966430@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 c45674fbdda138814ca21138475219c96fa5aa1f ] While running tcpkill I experienced invalid header length values while receiving to check that a node doesn't try to send a invalid dlm message we also check on applications minimum allocation limit. Also use DEFAULT_BUFFER_SIZE as maximum allocation limit. The define LOWCOMMS_MAX_TX_BUFFER_LEN is to calculate maximum buffer limits on application layer, future midcomms layer will subtract their needs from this define. Signed-off-by: Alexander Aring Signed-off-by: David Teigland Signed-off-by: Sasha Levin --- fs/dlm/lowcomms.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/dlm/lowcomms.c b/fs/dlm/lowcomms.c index 0f7fa23cccf0..f827d0b3962a 100644 --- a/fs/dlm/lowcomms.c +++ b/fs/dlm/lowcomms.c @@ -1375,9 +1375,11 @@ void *dlm_lowcomms_get_buffer(int nodeid, int len, gfp_t allocation, char **ppc) struct writequeue_entry *e; int offset = 0; - if (len > LOWCOMMS_MAX_TX_BUFFER_LEN) { - BUILD_BUG_ON(PAGE_SIZE < LOWCOMMS_MAX_TX_BUFFER_LEN); + if (len > DEFAULT_BUFFER_SIZE || + len < sizeof(struct dlm_header)) { + BUILD_BUG_ON(PAGE_SIZE < DEFAULT_BUFFER_SIZE); log_print("failed to allocate a buffer of size %d", len); + WARN_ON(1); return NULL; } -- 2.30.2