From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754336AbdGSKZp (ORCPT ); Wed, 19 Jul 2017 06:25:45 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:42234 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753694AbdGSKZj (ORCPT ); Wed, 19 Jul 2017 06:25:39 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Sowmini Varadhan , Santosh Shilimkar , "David S. Miller" Subject: [PATCH 4.9 21/72] rds: tcp: use sock_create_lite() to create the accept socket Date: Wed, 19 Jul 2017 12:24:15 +0200 Message-Id: <20170719102439.155272962@linuxfoundation.org> X-Mailer: git-send-email 2.13.3 In-Reply-To: <20170719102435.760649060@linuxfoundation.org> References: <20170719102435.760649060@linuxfoundation.org> User-Agent: quilt/0.65 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 4.9-stable review patch. If anyone has any objections, please let me know. ------------------ From: Sowmini Varadhan commit 0933a578cd55b02dc80f219dc8f2efb17ec61c9a upstream. There are two problems with calling sock_create_kern() from rds_tcp_accept_one() 1. it sets up a new_sock->sk that is wasteful, because this ->sk is going to get replaced by inet_accept() in the subsequent ->accept() 2. The new_sock->sk is a leaked reference in sock_graft() which expects to find a null parent->sk Avoid these problems by calling sock_create_lite(). Signed-off-by: Sowmini Varadhan Acked-by: Santosh Shilimkar Signed-off-by: David S. Miller Signed-off-by: Greg Kroah-Hartman --- net/rds/tcp_listen.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/net/rds/tcp_listen.c +++ b/net/rds/tcp_listen.c @@ -129,7 +129,7 @@ int rds_tcp_accept_one(struct socket *so if (!sock) /* module unload or netns delete in progress */ return -ENETUNREACH; - ret = sock_create_kern(sock_net(sock->sk), sock->sk->sk_family, + ret = sock_create_lite(sock->sk->sk_family, sock->sk->sk_type, sock->sk->sk_protocol, &new_sock); if (ret)