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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 84F16C7618B for ; Fri, 26 Jul 2019 15:34:10 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4A26D22BF5 for ; Fri, 26 Jul 2019 15:34:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564155250; bh=FppCgspIlyeTEQF7WqwK6Y7pgeDrCo7BI5JBXeA4STw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Y8xjU8K+oOqlrjDbPSFcdioVagskU7KMPBSl81YJ34eGUbbvf0kINQR8kolfU1UnI gSDWlWl+MVug+6oqgdPSM4JtbCQBEKRWk+yveSvhw/a/lBj/HCGs/Mazn511/74PXX b5Cn4M6vCc9Kt+xBoWCj7FlIGBG+TfXHkNQcaqLY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389798AbfGZPeJ (ORCPT ); Fri, 26 Jul 2019 11:34:09 -0400 Received: from mail.kernel.org ([198.145.29.99]:49646 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389782AbfGZPeG (ORCPT ); Fri, 26 Jul 2019 11:34:06 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3D367218D4; Fri, 26 Jul 2019 15:34:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1564155245; bh=FppCgspIlyeTEQF7WqwK6Y7pgeDrCo7BI5JBXeA4STw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=D+Bitiz8/VIjI8Lb965S938nSoqHXvnkCnAnmC9p8t8sXDW5EMv4zUEGVFY/sDNOY 2ifZWy1HpSZJPRUfXPImR46qAeX+vNWyUj5lUh/5u4lW67VYVYBkxg7dhuJ989A1Z4 zDtfWL99L2BrgaPIbJB1PV/vifV9t8jLBEhpajUM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, syzbot+079bf326b38072f849d9@syzkaller.appspotmail.com, Xin Long , Marcelo Ricardo Leitner , "David S. Miller" Subject: [PATCH 4.19 31/50] sctp: not bind the socket in sctp_connect Date: Fri, 26 Jul 2019 17:25:06 +0200 Message-Id: <20190726152303.824062269@linuxfoundation.org> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190726152300.760439618@linuxfoundation.org> References: <20190726152300.760439618@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Xin Long [ Upstream commit 9b6c08878e23adb7cc84bdca94d8a944b03f099e ] Now when sctp_connect() is called with a wrong sa_family, it binds to a port but doesn't set bp->port, then sctp_get_af_specific will return NULL and sctp_connect() returns -EINVAL. Then if sctp_bind() is called to bind to another port, the last port it has bound will leak due to bp->port is NULL by then. sctp_connect() doesn't need to bind ports, as later __sctp_connect will do it if bp->port is NULL. So remove it from sctp_connect(). While at it, remove the unnecessary sockaddr.sa_family len check as it's already done in sctp_inet_connect. Fixes: 644fbdeacf1d ("sctp: fix the issue that flags are ignored when using kernel_connect") Reported-by: syzbot+079bf326b38072f849d9@syzkaller.appspotmail.com Signed-off-by: Xin Long Acked-by: Marcelo Ricardo Leitner Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/sctp/socket.c | 20 ++------------------ 1 file changed, 2 insertions(+), 18 deletions(-) --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -4507,34 +4507,18 @@ out_nounlock: static int sctp_connect(struct sock *sk, struct sockaddr *addr, int addr_len, int flags) { - struct inet_sock *inet = inet_sk(sk); struct sctp_af *af; - int err = 0; + int err = -EINVAL; lock_sock(sk); pr_debug("%s: sk:%p, sockaddr:%p, addr_len:%d\n", __func__, sk, addr, addr_len); - /* We may need to bind the socket. */ - if (!inet->inet_num) { - if (sk->sk_prot->get_port(sk, 0)) { - release_sock(sk); - return -EAGAIN; - } - inet->inet_sport = htons(inet->inet_num); - } - /* Validate addr_len before calling common connect/connectx routine. */ af = sctp_get_af_specific(addr->sa_family); - if (!af || addr_len < af->sockaddr_len) { - err = -EINVAL; - } else { - /* Pass correct addr len to common routine (so it knows there - * is only one address being passed. - */ + if (af && addr_len >= af->sockaddr_len) err = __sctp_connect(sk, addr, af->sockaddr_len, flags, NULL); - } release_sock(sk); return err;