netdev - [PATCH net] rds: Incorrect reference counting in TCP socket creation

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Message-Id: <3403bcbebd03837eec0f86a346daf5c109db2a19.1519879295.git.ka-cheong.poon@oracle.com>
Date:   Wed, 28 Feb 2018 20:44:23 -0800
From:   Ka-Cheong Poon <ka-cheong.poon@...cle.com>
To:     netdev@...r.kernel.org
Cc:     santosh.shilimkar@...cle.com, davem@...emloft.net,
        rds-devel@....oracle.com
Subject: [PATCH net] rds: Incorrect reference counting in TCP socket creation

Commit 0933a578cd55 ("rds: tcp: use sock_create_lite() to create the
accept socket") has a reference counting issue in TCP socket creation
when accepting a new connection.  The code uses sock_create_lite() to
create a kernel socket.  But it does not do __module_get() on the
socket owner.  When the connection is shutdown and sock_release() is
called to free the socket, the owner's reference count is decremented
and becomes incorrect.  Note that this bug only shows up when the socket
owner is configured as a kernel module.

Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@...cle.com>
---
 net/rds/tcp_listen.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/net/rds/tcp_listen.c b/net/rds/tcp_listen.c
index c061d6e..d62c986 100644
--- a/net/rds/tcp_listen.c
+++ b/net/rds/tcp_listen.c
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006 Oracle.  All rights reserved.
+ * Copyright (c) 2006, 2018 Oracle.  All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
@@ -142,12 +142,17 @@ int rds_tcp_accept_one(struct socket *sock)
 	if (ret)
 		goto out;
 
-	new_sock->type = sock->type;
-	new_sock->ops = sock->ops;
 	ret = sock->ops->accept(sock, new_sock, O_NONBLOCK, true);
 	if (ret < 0)
 		goto out;
 
+	new_sock->ops = sock->ops;
+	/* sock_create_lite() does not get a hold on the owner module so we
+	 * need to do it here.  No need to do try_module_get() as the listener
+	 * should have a hold already.
+	 */
+	__module_get(new_sock->ops->owner);
+
 	ret = rds_tcp_keepalive(new_sock);
 	if (ret < 0)
 		goto out;
-- 
1.8.3.1