[added to the 4.1 stable tree] rtnl: fix msg size calculation in if_nlmsg_size()

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From: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>

This patch has been added to the 4.1 stable tree. If you have any
objections, please let us know.

===============

[ Upstream commit c57c7a95da842807b475b823ed2e5435c42cb3b0 ]

Size of the attribute IFLA_PHYS_PORT_NAME was missing.

Fixes: db24a9044ee1 ("net: add support for phys_port_name")
CC: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@xxxxxxxxx>
Acked-by: David Ahern <dsahern@xxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
---
 net/core/rtnetlink.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index fe95cb7..31a46a7 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -884,7 +884,9 @@ static noinline size_t if_nlmsg_size(const struct net_device *dev,
 	       + rtnl_link_get_size(dev) /* IFLA_LINKINFO */
 	       + rtnl_link_get_af_size(dev) /* 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(MAX_PHYS_ITEM_ID_LEN) /* IFLA_PHYS_SWITCH_ID */
+	       + nla_total_size(IFNAMSIZ); /* IFLA_PHYS_PORT_NAME */
+
 }
 
 static int rtnl_vf_ports_fill(struct sk_buff *skb, struct net_device *dev)
-- 
2.5.0

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