[libvirt] [PATCHv2 1/2] util: allow sending mac addr to virNetNewLink without ifindex

From: Laine Stump <laine(a)redhat.com&gt; Although until now, any use of the extra_args argument (a pointer to a struct containing extra attributes to add the the RTM_NEWLINK message) would always have the ifindex and mac set, so the code could assume it was safe to add both to the message if extra_args != NULL. There is now a use for setting a MAC address in the RTM_NEWLINK without setting the ifindex, so we should check each of these separately. Signed-off-by: Laine Stump <laine(a)redhat.com&gt; --- src/util/virnetlink.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/src/util/virnetlink.c b/src/util/virnetlink.c index ab41b57672..f18946061c 100644 --- a/src/util/virnetlink.c +++ b/src/util/virnetlink.c @@ -548,9 +548,14 @@ virNetlinkNewLink(const char *ifname, NETLINK_MSG_NEST_END(nl_msg, linkinfo); if (extra_args) { - NETLINK_MSG_PUT(nl_msg, IFLA_LINK, + if (extra_args->ifindex) { + NETLINK_MSG_PUT(nl_msg, IFLA_LINK, sizeof(uint32_t), extra_args->ifindex); - NETLINK_MSG_PUT(nl_msg, IFLA_ADDRESS, VIR_MAC_BUFLEN, extra_args->mac); + } + if (extra_args->mac) { + NETLINK_MSG_PUT(nl_msg, IFLA_ADDRESS, + VIR_MAC_BUFLEN, extra_args->mac); + } } if (virNetlinkCommand(nl_msg, &resp, &buflen, 0, 0, NETLINK_ROUTE, 0) < 0) -- 2.23.0