From patchwork Mon Jul 12 06:07:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "gregkh@linuxfoundation.org" X-Patchwork-Id: 473563 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, URIBL_BLOCKED, 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 2B537C07E99 for ; Mon, 12 Jul 2021 07:53:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 11D0D61474 for ; Mon, 12 Jul 2021 07:53:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348799AbhGLH4G (ORCPT ); Mon, 12 Jul 2021 03:56:06 -0400 Received: from mail.kernel.org ([198.145.29.99]:35488 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350713AbhGLHvO (ORCPT ); Mon, 12 Jul 2021 03:51:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id ABA766191A; Mon, 12 Jul 2021 07:47:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1626076053; bh=DtxPYX7uCBlwj0jULAwa+5gtQTwcVooFOqJZif4rFkY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=czYsL+rO3XcJUPxSPzy1k7aZe/PgbptvY/Xw1dsOfd4nUBGrT/gI/lEy/23seLaA8 WBf551CS5Z6jEBP/T8ft3OmOapbrzGjmsAxcxOHY5id76Zx6UBgySnoxjKvtZJI8OX S26CtvI+xMeR30qmtS3nZsbyi+aFbbuiHi65/5JM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Jianguo Wu , Mat Martineau , Jakub Kicinski , Sasha Levin Subject: [PATCH 5.13 425/800] mptcp: generate subflow hmac after mptcp_finish_join() Date: Mon, 12 Jul 2021 08:07:28 +0200 Message-Id: <20210712061012.352920878@linuxfoundation.org> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20210712060912.995381202@linuxfoundation.org> References: <20210712060912.995381202@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Jianguo Wu [ Upstream commit 0a4d8e96e4fd687af92b961d5cdcea0fdbde05fe ] For outgoing subflow join, when recv SYNACK, in subflow_finish_connect(), the mptcp_finish_join() may return false in some cases, and send a RESET to remote, and no local hmac is required. So generate subflow hmac after mptcp_finish_join(). Fixes: ec3edaa7ca6c ("mptcp: Add handling of outgoing MP_JOIN requests") Signed-off-by: Jianguo Wu Signed-off-by: Mat Martineau Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- net/mptcp/subflow.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/net/mptcp/subflow.c b/net/mptcp/subflow.c index be1de4084196..3a396451d628 100644 --- a/net/mptcp/subflow.c +++ b/net/mptcp/subflow.c @@ -430,15 +430,15 @@ static void subflow_finish_connect(struct sock *sk, const struct sk_buff *skb) goto do_reset; } + if (!mptcp_finish_join(sk)) + goto do_reset; + subflow_generate_hmac(subflow->local_key, subflow->remote_key, subflow->local_nonce, subflow->remote_nonce, hmac); memcpy(subflow->hmac, hmac, MPTCPOPT_HMAC_LEN); - if (!mptcp_finish_join(sk)) - goto do_reset; - subflow->mp_join = 1; MPTCP_INC_STATS(sock_net(sk), MPTCP_MIB_JOINSYNACKRX);