Bluetooth: Don't accept ConfigReq if we aren't in the BT_CONFIG state

If such event happens we shall reply with a Command Reject, because we are
not expecting any configure request.

Signed-off-by: Gustavo F. Padovan <padovan@profusion.mobi>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

1 files changed, 7 insertions, 1 deletions

diff --git a/net/bluetooth/l2cap.c b/net/bluetooth/l2cap.c
index c12eccfdfe01..c791fcda7b2d 100644
--- a/net/bluetooth/l2cap.c
+++ b/net/bluetooth/l2cap.c
@@ -3124,8 +3124,14 @@ static inline int l2cap_config_req(struct l2cap_conn *conn, struct l2cap_cmd_hdr
         if (!sk)
                 return -ENOENT;
 
-        if (sk->sk_state == BT_DISCONN)
+        if (sk->sk_state != BT_CONFIG) {
+                struct l2cap_cmd_rej rej;
+
+                rej.reason = cpu_to_le16(0x0002);
+                l2cap_send_cmd(conn, cmd->ident, L2CAP_COMMAND_REJ,
+                                sizeof(rej), &rej);
                 goto unlock;
+        }
 
         /* Reject if config buffer is too small. */
         len = cmd_len - sizeof(*req);