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rtnetlink: call validate_linkmsg in rtnl_create_link

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[ Upstream commit b0ad3c1790 ]

validate_linkmsg() was introduced by commit 1840bb13c2 ("[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: 0e06877c6f ("[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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Xin Long 2023-05-31 12:01:42 -04:00 committed by Greg Kroah-Hartman
parent beeffe764e
commit 8ac106aade
1 changed files with 7 additions and 1 deletions
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8
net/core/rtnetlink.c
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@ -3155,6 +3155,7 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
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]);
@ -3190,13 +3191,18 @@ struct net_device *rtnl_create_link(struct net *net, const char *ifname,
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) {