rtnetlink: NUL-terminate IFLA_PHYS_PORT_NAME string

IFLA_PHYS_PORT_NAME is a string attribute, so terminate it with \0.
Otherwise libnl3 fails to validate netlink messages with this attribute.
"ip -detail a" assumes too that the attribute is NUL-terminated when
printing it. It often was, due to padding.

I noticed this as libvirtd failing to start on a system with sfc driver
after upgrading it to Linux 4.11, i.e. when sfc added support for
phys_port_name.

Signed-off-by: Michal Schmidt <mschmidt@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 6e67315ec368..bcb0f610ee42 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -1054,7 +1054,7 @@ static int rtnl_phys_port_name_fill(struct sk_buff *skb, struct net_device *dev)
                 return err;
         }
 
-        if (nla_put(skb, IFLA_PHYS_PORT_NAME, strlen(name), name))
+        if (nla_put_string(skb, IFLA_PHYS_PORT_NAME, name))
                 return -EMSGSIZE;
 
         return 0;