Bluetooth: Fix getting SCO socket options in deferred state

When a socket is in deferred state there does actually exist an
underlying connection even though the connection state is not yet
BT_CONNECTED. In the deferred state it should therefore be allowed to
get socket options that usually depend on a connection, such as
SCO_OPTIONS and SCO_CONNINFO.

This patch fixes the behavior of some user space code that behaves as
follows without it:

$ sudo tools/btiotest -i 00:1B:DC:xx:xx:xx -d -s
accept=2 reject=-1 discon=-1 defer=1 sec=0 update_sec=0 prio=0 voice=0x0000
Listening for SCO connections
bt_io_get(OPT_DEST): getsockopt(SCO_OPTIONS): Transport endpoint is not connected (107)
Accepting connection
Successfully connected to 60:D8:19:xx:xx:xx. handle=43, class=000000

The conditions that the patch updates the if-statements to is taken from
similar code in l2cap_sock.c which correctly handles the deferred state.
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

net/bluetooth/sco.c

@@ -765,7 +765,9 @@ static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user
 
 	switch (optname) {
 	case SCO_OPTIONS:
-		if (sk->sk_state != BT_CONNECTED) {
+		if (sk->sk_state != BT_CONNECTED &&
+		    !(sk->sk_state == BT_CONNECT2 &&
+		      test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
 			err = -ENOTCONN;
 			break;
 		}
@@ -781,7 +783,9 @@ static int sco_sock_getsockopt_old(struct socket *sock, int optname, char __user
 		break;
 
 	case SCO_CONNINFO:
-		if (sk->sk_state != BT_CONNECTED) {
+		if (sk->sk_state != BT_CONNECTED &&
+		    !(sk->sk_state == BT_CONNECT2 &&
+		      test_bit(BT_SK_DEFER_SETUP, &bt_sk(sk)->flags))) {
 			err = -ENOTCONN;
 			break;
 		}