Bluetooth: Fix CID initialization for fixed channels

Fixed channels have the same source and destination CID. Ensure that the
values get properly initialized when receiving incoming connections and
deriving values from the parent socket.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/net/bluetooth/l2cap_sock.c b/net/bluetooth/l2cap_sock.c
index 7ad346ea06ed..ae4f6b593fc0 100644
--- a/net/bluetooth/l2cap_sock.c
+++ b/net/bluetooth/l2cap_sock.c
@@ -1470,6 +1470,11 @@ static void l2cap_sock_init(struct sock *sk, struct sock *parent)
                 chan->tx_credits = pchan->tx_credits;
                 chan->rx_credits = pchan->rx_credits;
 
+                if (chan->chan_type == L2CAP_CHAN_FIXED) {
+                        chan->scid = pchan->scid;
+                        chan->dcid = pchan->scid;
+                }
+
                 security_sk_clone(parent, sk);
         } else {
                 switch (sk->sk_type) {