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rtnetlink: NUL-terminate IFLA_PHYS_PORT_NAME string

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[ Upstream commit 77ef033b68 ]

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Michal Schmidt 2017-05-04 16:48:58 +02:00 committed by Greg Kroah-Hartman
parent 1a12d19257
commit 545f144825
1 changed files with 1 additions and 1 deletions
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2
net/core/rtnetlink.c
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@ -1018,7 +1018,7 @@ 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;