# Re: \[PATCH net-next 2/2\] Add a eBPF helper function to retrieve socket uid

- From: Eric Dumazet \<hidden\>
- Date: 2017-02-03 00:31:03 
- List: netdev
- Page: https://ratatoskr.run/netdev/2017/02/11043402
- Thread: https://ratatoskr.run/netdev/2017/02/11043370/t.md

```text
On Fri, 2017-02-03 at 09:00 +0900, Lorenzo Colitti wrote:
> On Fri, Feb 3, 2017 at 6:32 AM, Daniel Borkmann [ref] wrote:
> >> +       sk = skb->sk;
> >> +       kuid = sock_net_uid(dev_net(skb->dev), sk);
> >
> >
> > Don't you need to test for fullsock? Do you mean something like below?
> 
> It should be safe to call sock_net_uid on any type of socket
> (including NULL). sk_uid was added to struct sock in 86741ec25462
> ("net: core: Add a UID field to struct sock.")

But a request socket or a timewait socket do not have this field.

Daniel point is valid.
```