net: sock: validate data_len before allocating skb in sock_alloc_send_pskb()

We need to validate the number of pages consumed by data_len, otherwise frags
array could be overflowed by userspace. So this patch validate data_len and
return -EMSGSIZE when data_len may occupies more frags than MAX_SKB_FRAGS.

Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
void sock_update_netprioidx(struct sock *sk)
{
	if (in_interrupt())
		return;

	sk->sk_cgrp_prioidx = task_netprioidx(current);
}

void sock_update_netprioidx(struct sock *sk)
{
	if (in_interrupt())
		return;

	sk->sk_cgrp_prioidx = task_netprioidx(current);
}
