From: Xin Long <lucien.xin@xxxxxxxxx>
[ Upstream commit b0ad3c179059089d809b477a1d445c1183a7b8fe ]
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@xxxxxxxxx>
Reviewed-by: Simon Horman <simon.horman@xxxxxxxxxxxx>
Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
net/core/rtnetlink.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index 8c85e93daa739..bc187289bf64b 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -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) {
--
2.39.2
