From 77ef033b687c3e030017c94a29bf6ea3aaaef678 Mon Sep 17 00:00:00 2001 From: Michal Schmidt Date: Thu, 4 May 2017 16:48:58 +0200 Subject: [PATCH] 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 Signed-off-by: David S. Miller --- net/core/rtnetlink.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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; -- 2.20.1