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[204.195.71.95]) by smtp.gmail.com with ESMTPSA id x4sm8308402pfb.78.2018.02.03.11.17.03 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Sat, 03 Feb 2018 11:17:04 -0800 (PST) Date: Sat, 3 Feb 2018 11:17:01 -0800 From: Stephen Hemminger To: Christian Brauner Cc: netdev@vger.kernel.org, ebiederm@xmission.com, jbenc@redhat.com, nicolas.dichtel@6wind.com, linux-kernel@vger.kernel.org, dsahern@gmail.com, davem@davemloft.net Subject: Re: [PATCH net 1/1 v1] rtnetlink: require unique netns identifier Message-ID: <20180203111701.2ff8d7a3@xeon-e3> In-Reply-To: <20180203132904.11972-2-christian.brauner@ubuntu.com> References: <20180203132904.11972-1-christian.brauner@ubuntu.com> <20180203132904.11972-2-christian.brauner@ubuntu.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 3 Feb 2018 14:29:04 +0100 Christian Brauner wrote: > +static int rtnl_ensure_unique_netns_attr(const struct sock *sk, > + struct nlattr *tb[], > + struct netlink_ext_ack *extack) > +{ > + int ret = -EINVAL; > + struct net *net = NULL, *unique_net = NULL; > + > + /* Requests without network namespace ids have been able to specify > + * multiple properties referring to different network namespaces so > + * don't regress them. > + */ > + if (!tb[IFLA_IF_NETNSID]) > + return 0; > + > + if (!tb[IFLA_NET_NS_PID] && !tb[IFLA_NET_NS_FD]) > + return 0; Isn't this an error? > + > + unique_net = get_net_ns_by_id(sock_net(sk), nla_get_s32(tb[IFLA_IF_NETNSID])); > + if (!unique_net) > + return -1; Other paths are returning errno, so why -1 here?