Disable UDP Lite - method 1

diff '--color=auto' -r -u20 a/net/socket.c b/net/socket.c
--- a/net/socket.c  2026-06-09 13:28:53.000000000 +0300
+++ b/net/socket.c  2026-06-15 15:22:33.020499207 +0300
@@ -1529,40 +1529,42 @@
  * Returns 0 or an error. On failure @res is set to %NULL. @kern must
  * be set to true if the socket resides in kernel space.
  * This function internally uses GFP_KERNEL.
  */

 int __sock_create(struct net *net, int family, int type, int protocol,
             struct socket **res, int kern)
 {
    int err;
    struct socket *sock;
    const struct net_proto_family *pf;

    /*
     *      Check protocol is in range
     */
    if (family < 0 || family >= NPROTO)
        return -EAFNOSUPPORT;
    if (type < 0 || type >= SOCK_MAX)
        return -EINVAL;

+   if (   ((family == AF_INET) || (family == AF_INET6)) && (protocol == IPPROTO_UDPLITE)   ) { return -EPERM; }
+
    /* Compatibility.

       This uglymoron is moved from INET layer to here to avoid
       deadlock in module load.
     */
    if (family == PF_INET && type == SOCK_PACKET) {
        pr_info_once("%s uses obsolete (PF_INET,SOCK_PACKET)\n",
                 current->comm);
        family = PF_PACKET;
    }

    err = security_socket_create(family, type, protocol, kern);
    if (err)
        return err;

    /*
     *  Allocate the socket and allow the family to set things up. if
     *  the protocol is 0, the family is instructed to select an appropriate
     *  default.
     */