net: add skb_to_full_sk() helper and use it in selinux_netlbl_skbuff_setsid()

net: add skb_to_full_sk() helper and use it in selinux_netlbl_skbuff_setsid()

Generalize selinux_skb_sk() added in commit adb7ffd5f665
("selinux: fix random read in selinux_ip_postroute_compat()")
so that we can use it other contexts.

Use it right away in selinux_netlbl_skbuff_setsid()

Fixes: 4b6a53b8f218 ("tcp: attach SYNACK messages to request sockets instead of listener")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>