Bluetooth: Always use l2cap_chan->psm for returning PSM to user space

The l2cap_chan->psm value is always set to a valid value for a
connection oriented channel. The l2cap_chan->sport is used for tracking
local PSM allocations but will not always have a proper value, such as
with connected sockets derived from a listening socket. This patch fixes
the sock_getname callback to always use chan->psm when returning address
information.
Signed-off-by: NJohan Hedberg <johan.hedberg@intel.com>
Signed-off-by: NMarcel Holtmann <marcel@holtmann.org>

net/bluetooth/l2cap_sock.c

@@ -373,13 +373,13 @@ static int l2cap_sock_getname(struct socket *sock, struct sockaddr *addr,
 	addr->sa_family = AF_BLUETOOTH;
 	*len = sizeof(struct sockaddr_l2);
 
+	la->l2_psm = chan->psm;
+
 	if (peer) {
-		la->l2_psm = chan->psm;
 		bacpy(&la->l2_bdaddr, &chan->dst);
 		la->l2_cid = cpu_to_le16(chan->dcid);
 		la->l2_bdaddr_type = chan->dst_type;
 	} else {
-		la->l2_psm = chan->sport;
 		bacpy(&la->l2_bdaddr, &chan->src);
 		la->l2_cid = cpu_to_le16(chan->scid);
 		la->l2_bdaddr_type = chan->src_type;