rtnl: fix msg size calculation in if_nlmsg_size()

[ Upstream commit c57c7a9 ]

Size of the attribute IFLA_PHYS_PORT_NAME was missing.

Fixes: db24a90 ("net: add support for phys_port_name")
CC: David Ahern <[email protected]>
Signed-off-by: Nicolas Dichtel <[email protected]>
Acked-by: David Ahern <[email protected]>
Signed-off-by: David S. Miller <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: NicolasDichtel

net/core/rtnetlink.c

@@ -905,6 +905,7 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
 	       + rtnl_link_get_af_size(dev, ext_filter_mask) /* IFLA_AF_SPEC */
 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_PORT_ID */
 	       + nla_total_size(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
+	       + nla_total_size(IFNAMSIZ) /* IFLA_PHYS_PORT_NAME */
 	       + nla_total_size(1); /* IFLA_PROTO_DOWN */
 
 }