diff --git a/net/bluetooth/cmtp/core.c b/net/bluetooth/cmtp/core.c
index 67fe5e84e68f0bffb166bbcfb6cdb736f15ab05e..278a194e6af488f67197c3725ca937f554989498 100644
--- a/net/bluetooth/cmtp/core.c
+++ b/net/bluetooth/cmtp/core.c
@@ -334,6 +334,9 @@ int cmtp_add_connection(struct cmtp_connadd_req *req, struct socket *sock)
 
 	BT_DBG("");
 
+	if (!l2cap_is_socket(sock))
+		return -EBADFD;
+
 	session = kzalloc(sizeof(struct cmtp_session), GFP_KERNEL);
 	if (!session)
 		return -ENOMEM;