Patch "sctp: set sin_port for addr param when checking duplicate address" has been added to the 4.10-stable tree

This is a note to let you know that I've just added the patch titled

sctp: set sin_port for addr param when checking duplicate address

to the 4.10-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
sctp-set-sin_port-for-addr-param-when-checking-duplicate-address.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Xin Long <[email protected]>
Date: Fri, 24 Feb 2017 15:18:46 +0800
Subject: sctp: set sin_port for addr param when checking duplicate address

From: Xin Long <[email protected]>

[ Upstream commit 2e3ce5bc2aa938653c3866aa7f4901a1f199b1c8 ]

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.

---
 net/sctp/protocol.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

@@ -199,6 +199,7 @@ int sctp_copy_local_addr_list(struct net
 			      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
 		     !(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),

Patches currently in stable-queue which might be from [email protected] are

queue-4.10/sctp-deny-peeloff-operation-on-asocs-with-threads-sleeping-on-it.patch queue-4.10/sctp-set-sin_port-for-addr-param-when-checking-duplicate-address.patch queue-4.10/ipv6-make-ecmp-route-replacement-less-greedy.patch