rtnetlink: do not depend on RTNL for IFLA_IFNAME output

We can use netdev_copy_name() to no longer rely on RTNL
to fetch dev->name.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index ba5301d6df849d7d0c4c79989ba4fc68a5758df0..eb1a151c69107b84b57fb364c153bff6cfc10eb3 100644 (file)
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1812,6 +1812,7 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
                            u32 event, int *new_nsid, int new_ifindex,
                            int tgt_netnsid, gfp_t gfp)
 {
+       char devname[IFNAMSIZ];
        struct ifinfomsg *ifm;
        struct nlmsghdr *nlh;
        struct Qdisc *qdisc;
@@ -1832,8 +1833,11 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb,
        if (tgt_netnsid >= 0 && nla_put_s32(skb, IFLA_TARGET_NETNSID, tgt_netnsid))
                goto nla_put_failure;
 
-       if (nla_put_string(skb, IFLA_IFNAME, dev->name) ||
-           nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
+       netdev_copy_name(dev, devname);
+       if (nla_put_string(skb, IFLA_IFNAME, devname))
+               goto nla_put_failure;
+
+       if (nla_put_u32(skb, IFLA_TXQLEN, dev->tx_queue_len) ||
            nla_put_u8(skb, IFLA_OPERSTATE,
                       netif_running(dev) ? dev->operstate : IF_OPER_DOWN) ||
            nla_put_u8(skb, IFLA_LINKMODE, dev->link_mode) ||