# Calculate format=diff
diff --git a/net/core/sock_diag.c b/net/core/sock_diag.c
index 602cd63..750f44f 100644
--- a/net/core/sock_diag.c
+++ b/net/core/sock_diag.c
@@ -121,6 +121,9 @@ static int __sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
	if (nlmsg_len(nlh) < sizeof(*req))
		return -EINVAL;

+	if (req->sdiag_family >= AF_MAX)
+		return -EINVAL;
+
	hndl = sock_diag_lock_handler(req->sdiag_family);
	if (hndl == NULL)
		err = -ENOENT;