diff --git a/fs/hmdfs/comm/transport.c b/fs/hmdfs/comm/transport.c
index 9f65f618a746d009378a757c1a2356e70e414761..1b52f46b69b8e0151f1bd8f940d5ab8f7d342027 100644
--- a/fs/hmdfs/comm/transport.c
+++ b/fs/hmdfs/comm/transport.c
@@ -896,12 +896,15 @@ static bool is_tcp_socket(struct tcp_handle *tcp)
 		return false;
 	}
 
-	if (tcp->sock->sk->sk_protocol != IPPROTO_TCP) {
+	lock_sock(tcp->sock->sk);
+	if (tcp->sock->sk->sk_protocol != IPPROTO_TCP ||
+	    tcp->sock->type != SOCK_STREAM ||
+	    tcp->sock->sk->sk_family != AF_INET) {
 		hmdfs_err("invalid socket protocol");
+		release_sock(tcp->sock->sk);
 		return false;
 	}
 
-	lock_sock(tcp->sock->sk);
 	icsk = inet_csk(tcp->sock->sk);
 	if (icsk->icsk_ulp_ops) {
 		hmdfs_err("ulp not NULL");