[Bluetooth] Finish L2CAP configuration only with acceptable settings

The parameters of the L2CAP output configuration might not be accepted
after the first configuration round. So only indicate a finished output
configuration when acceptable settings are provided.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 10 insertions, 6 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index 36ef27b625db..6ce693d2e5b9 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -1370,8 +1370,10 @@ static int l2cap_parse_conf_req(struct sock *sk, void *data)
 
                 if (pi->conf_mtu < pi->omtu)
                         result = L2CAP_CONF_UNACCEPT;
-                else
+                else {
                         pi->omtu = pi->conf_mtu;
+                        pi->conf_state |= L2CAP_CONF_OUTPUT_DONE;
+                }
 
                 l2cap_add_conf_opt(&ptr, L2CAP_CONF_MTU, 2, pi->omtu);
         }
@@ -1577,16 +1579,19 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
 
         l2cap_send_cmd(conn, cmd->ident, L2CAP_CONF_RSP, len, rsp);
 
-        /* Output config done. */
-        l2cap_pi(sk)->conf_state |= L2CAP_CONF_OUTPUT_DONE;
-
         /* Reset config buffer. */
         l2cap_pi(sk)->conf_len = 0;
 
+        if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE))
+                goto unlock;
+
         if (l2cap_pi(sk)->conf_state & L2CAP_CONF_INPUT_DONE) {
                 sk->sk_state = BT_CONNECTED;
                 l2cap_chan_ready(sk);
-        } else if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
+                goto unlock;
+        }
+
+        if (!(l2cap_pi(sk)->conf_state & L2CAP_CONF_REQ_SENT)) {
                 u8 req[64];
                 l2cap_send_cmd(conn, l2cap_get_ident(conn), L2CAP_CONF_REQ,
                                         l2cap_build_conf_req(sk, req), req);
@@ -1646,7 +1651,6 @@ static inline int l2cap_config_rsp(struct l2cap_conn *conn, struct l2cap_cmd_hdr
         if (flags & 0x01)
                 goto done;
 
-        /* Input config done */
         l2cap_pi(sk)->conf_state |= L2CAP_CONF_INPUT_DONE;
 
         if (l2cap_pi(sk)->conf_state & L2CAP_CONF_OUTPUT_DONE) {