sctp: set sin_port for addr param when checking duplicate address

Commit b8607805dd15 ("sctp: not copying duplicate addrs to the assoc's
bind address list") tried to check for duplicate address before copying
to asoc's bind_addr list from global addr list.

But all the addrs' sin_ports in global addr list are 0 while the addrs'
sin_ports are bp->port in asoc's bind_addr list. It means even if it's
a duplicate address, af->cmp_addr will still return 0 as the their
sin_ports are different.

This patch is to fix it by setting the sin_port for addr param with
bp->port before comparing the addrs.

Fixes: b8607805dd15 ("sctp: not copying duplicate addrs to the assoc's bind address list")
Reported-by: Wei Chen <weichen@redhat.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 1 deletions

diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c
index 8227bbbd077a..1b6d4574d2b0 100644
--- a/net/sctp/protocol.c
+++ b/net/sctp/protocol.c
@@ -199,6 +199,7 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
                               sctp_scope_t scope, gfp_t gfp, int copy_flags)
 {
         struct sctp_sockaddr_entry *addr;
+        union sctp_addr laddr;
         int error = 0;
 
         rcu_read_lock();
@@ -220,7 +221,10 @@ int sctp_copy_local_addr_list(struct net *net, struct sctp_bind_addr *bp,
                      !(copy_flags & SCTP_ADDR6_PEERSUPP)))
                         continue;
 
-                if (sctp_bind_addr_state(bp, &addr->a) != -1)
+                laddr = addr->a;
+                /* also works for setting ipv6 address port */
+                laddr.v4.sin_port = htons(bp->port);
+                if (sctp_bind_addr_state(bp, &laddr) != -1)
                         continue;
 
                 error = sctp_add_bind_addr(bp, &addr->a, sizeof(addr->a),