Al Viro <v...@zeniv.linux.org.uk> wrote:

> -     if (fc->user_ns)
> -             put_user_ns(fc->user_ns);
> -     fc->user_ns = get_user_ns(netns->user_ns);
> +     if (netns) {
> +             if (fc->user_ns)
> +                     put_user_ns(fc->user_ns);
> +             fc->user_ns = get_user_ns(netns->user_ns);
> +     }

This begs the question why is sysfs using the current network namespace's idea
of the user namespace?  Why not just use the one directly from current->cred?

David

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