From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul Gortmaker Subject: [PATCH net-next 09/16] tipc: Ensure network address change doesn't impact new port Date: Fri, 20 Apr 2012 17:05:17 -0400 Message-ID: <1334955924-907-10-git-send-email-paul.gortmaker@windriver.com> References: <1334955924-907-1-git-send-email-paul.gortmaker@windriver.com> Mime-Version: 1.0 Content-Type: text/plain Cc: , , To: Return-path: Received: from mail.windriver.com ([147.11.1.11]:65459 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754285Ab2DTVFh (ORCPT ); Fri, 20 Apr 2012 17:05:37 -0400 In-Reply-To: <1334955924-907-1-git-send-email-paul.gortmaker@windriver.com> Sender: netdev-owner@vger.kernel.org List-ID: From: Allan Stephens Re-orders port creation logic so that the initialization of a new port's message header template occurs while the port list lock is held. This ensures that a change to the node's network address that occurs at the same time as the port is being created does not result in the template identifying the sender using the former network address. The new approach guarantees that the new port's template is using the current network address or that it will be updated when the address changes. Signed-off-by: Allan Stephens Signed-off-by: Paul Gortmaker --- net/tipc/port.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/net/tipc/port.c b/net/tipc/port.c index 6156c67..3b7162c 100644 --- a/net/tipc/port.c +++ b/net/tipc/port.c @@ -221,18 +221,25 @@ struct tipc_port *tipc_createport_raw(void *usr_handle, p_ptr->usr_handle = usr_handle; p_ptr->max_pkt = MAX_PKT_DEFAULT; p_ptr->ref = ref; - msg = &p_ptr->phdr; - tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0); - msg_set_origport(msg, ref); INIT_LIST_HEAD(&p_ptr->wait_list); INIT_LIST_HEAD(&p_ptr->subscription.nodesub_list); p_ptr->dispatcher = dispatcher; p_ptr->wakeup = wakeup; p_ptr->user_port = NULL; k_init_timer(&p_ptr->timer, (Handler)port_timeout, ref); - spin_lock_bh(&tipc_port_list_lock); INIT_LIST_HEAD(&p_ptr->publications); INIT_LIST_HEAD(&p_ptr->port_list); + + /* + * Must hold port list lock while initializing message header template + * to ensure a change to node's own network address doesn't result + * in template containing out-dated network address information + */ + + spin_lock_bh(&tipc_port_list_lock); + msg = &p_ptr->phdr; + tipc_msg_init(msg, importance, TIPC_NAMED_MSG, NAMED_H_SIZE, 0); + msg_set_origport(msg, ref); list_add_tail(&p_ptr->port_list, &ports); spin_unlock_bh(&tipc_port_list_lock); return p_ptr; -- 1.7.9.3