From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754455AbaDRJcM (ORCPT ); Fri, 18 Apr 2014 05:32:12 -0400 Received: from ip4-83-240-18-248.cust.nbox.cz ([83.240.18.248]:45972 "EHLO ip4-83-240-18-248.cust.nbox.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752335AbaDRJWs (ORCPT ); Fri, 18 Apr 2014 05:22:48 -0400 From: Jiri Slaby To: stable@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Ying Xue , "David S. Miller" , Jiri Slaby Subject: [PATCH 3.12 28/72] tipc: fix connection refcount leak Date: Fri, 18 Apr 2014 11:22:01 +0200 Message-Id: X-Mailer: git-send-email 1.9.2 In-Reply-To: <3389f243c528afc7c7300c83b8f296290cd3656d.1397812482.git.jslaby@suse.cz> References: <3389f243c528afc7c7300c83b8f296290cd3656d.1397812482.git.jslaby@suse.cz> In-Reply-To: References: Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ying Xue 3.12-stable review patch. If anyone has any objections, please let me know. =============== [ Upstream commit 4652edb70e8a7eebbe47fa931940f65522c36e8f ] When tipc_conn_sendmsg() calls tipc_conn_lookup() to query a connection instance, its reference count value is increased if it's found. But subsequently if it's found that the connection is closed, the work of sending message is not queued into its server send workqueue, and the connection reference count is not decreased. This will cause a reference count leak. To reproduce this problem, an application would need to open and closes topology server connections with high intensity. We fix this by immediately decrementing the connection reference count if a send fails due to the connection being closed. Signed-off-by: Ying Xue Acked-by: Erik Hugne Reviewed-by: Jon Maloy Signed-off-by: David S. Miller Signed-off-by: Jiri Slaby --- net/tipc/server.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/net/tipc/server.c b/net/tipc/server.c index ae474479f12e..bd2336aad0e4 100644 --- a/net/tipc/server.c +++ b/net/tipc/server.c @@ -427,10 +427,12 @@ int tipc_conn_sendmsg(struct tipc_server *s, int conid, list_add_tail(&e->list, &con->outqueue); spin_unlock_bh(&con->outqueue_lock); - if (test_bit(CF_CONNECTED, &con->flags)) + if (test_bit(CF_CONNECTED, &con->flags)) { if (!queue_work(s->send_wq, &con->swork)) conn_put(con); - + } else { + conn_put(con); + } return 0; } -- 1.9.2