From: Xin Long lucien.xin@gmail.com
commit b0ad3c179059089d809b477a1d445c1183a7b8fe upstream.
validate_linkmsg() was introduced by commit 1840bb13c22f5b ("[RTNL]: Validate hardware and broadcast address attribute for RTM_NEWLINK") to validate tb[IFLA_ADDRESS/BROADCAST] for existing links. The same check should also be done for newly created links.
This patch adds validate_linkmsg() call in rtnl_create_link(), to avoid the invalid address set when creating some devices like:
# ip link add dummy0 type dummy # ip link add link dummy0 name mac0 address 01:02 type macsec
Fixes: 0e06877c6fdb ("[RTNETLINK]: rtnl_link: allow specifying initial device address") Signed-off-by: Xin Long lucien.xin@gmail.com Reviewed-by: Simon Horman simon.horman@corigine.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/core/rtnetlink.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)
--- a/net/core/rtnetlink.c +++ b/net/core/rtnetlink.c @@ -3212,6 +3212,7 @@ struct net_device *rtnl_create_link(stru struct net_device *dev; unsigned int num_tx_queues = 1; unsigned int num_rx_queues = 1; + int err;
if (tb[IFLA_NUM_TX_QUEUES]) num_tx_queues = nla_get_u32(tb[IFLA_NUM_TX_QUEUES]); @@ -3247,13 +3248,18 @@ struct net_device *rtnl_create_link(stru if (!dev) return ERR_PTR(-ENOMEM);
+ err = validate_linkmsg(dev, tb, extack); + if (err < 0) { + free_netdev(dev); + return ERR_PTR(err); + } + dev_net_set(dev, net); dev->rtnl_link_ops = ops; dev->rtnl_link_state = RTNL_LINK_INITIALIZING;
if (tb[IFLA_MTU]) { u32 mtu = nla_get_u32(tb[IFLA_MTU]); - int err;
err = dev_validate_mtu(dev, mtu, extack); if (err) {