sctp: Allow bindx_del to accept 0 port

We allow 0 port when adding new addresses.  It only
makes sence to allow 0 port when removing addresses.
When removing the currently bound port will be used
when the port in the address is set to 0.

Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Wei Yongjun <yjwei@cn.fujitsu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 5c9980a..431b890 100644 (file)
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -658,11 +658,15 @@ static int sctp_bindx_rem(struct sock *sk, struct sockaddr *addrs, int addrcnt)
                        goto err_bindx_rem;
                }
 
-               if (sa_addr->v4.sin_port != htons(bp->port)) {
+               if (sa_addr->v4.sin_port &&
+                   sa_addr->v4.sin_port != htons(bp->port)) {
                        retval = -EINVAL;
                        goto err_bindx_rem;
                }
 
+               if (!sa_addr->v4.sin_port)
+                       sa_addr->v4.sin_port = htons(bp->port);
+
                /* FIXME - There is probably a need to check if sk->sk_saddr and
                 * sk->sk_rcv_addr are currently set to one of the addresses to
                 * be removed. This is something which needs to be looked into