rds: Second bind() can overwrite the first bind()

In rds_bind(), it does not check if a socket is already bound
or not.  Hence a second bind() will overwrite what is done in
the first bind().

Orabug: 27454254

Signed-off-by: Ka-Cheong Poon <[email protected]>
Reviewed-by: Håkon Bugge <[email protected]>
Signed-off-by: Somasundaram Krishnasamy <[email protected]>

Orabug: 33590097

UEK6 => UEK7

(cherry picked from commit df18568)
cherry-pick-repo=UEK/production/linux-uek.git

Signed-off-by: Gerd Rausch <[email protected]>
Reviewed-by: William Kucharski <[email protected]>

Orabug: 33590087

UEK7 => LUCI

(cherry picked from commit ba4efa8)
cherry-pick-repo=UEK/production/linux-uek.git

Signed-off-by: Gerd Rausch <[email protected]>
Reviewed-by: William Kucharski <[email protected]>

Author: kcp-git

net/rds/bind.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006, 2017 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2018 Oracle and/or its affiliates. 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
@@ -227,6 +227,12 @@ int rds_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 
 	lock_sock(sk);
 
+	/* RDS socket does not allow re-binding. */
+	if (!ipv6_addr_any(&rs->rs_bound_addr)) {
+		ret = -EINVAL;
+		goto out;
+	}
+
 	ret = rds_add_bound(rs, binding_addr, &port, scope_id);
 	if (ret)
 		goto out;