struct xdp_buff *xdp;
int i;
- if (ctl && (ctl->type == TUN_MSG_PTR)) {
+ if (m->msg_controllen == sizeof(struct tun_msg_ctl) &&
+ ctl && ctl->type == TUN_MSG_PTR) {
for (i = 0; i < ctl->num; i++) {
xdp = &((struct xdp_buff *)ctl->ptr)[i];
tap_get_user_xdp(q, xdp);
if (!tun)
return -EBADFD;
- if (ctl && (ctl->type == TUN_MSG_PTR)) {
+ if (m->msg_controllen == sizeof(struct tun_msg_ctl) &&
+ ctl && ctl->type == TUN_MSG_PTR) {
struct tun_page tpage;
int n = ctl->num;
int flush = 0;
goto signal_used;
msghdr->msg_control = &ctl;
+ msghdr->msg_controllen = sizeof(ctl);
err = sock->ops->sendmsg(sock, msghdr, 0);
if (unlikely(err < 0)) {
vq_err(&nvq->vq, "Fail to batch sending packets\n");