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authorMahesh Bandewar <maheshb@google.com>2022-11-16 04:19:14 +0300
committerDavid S. Miller <davem@davemloft.net>2022-11-18 13:39:22 +0300
commit40b9d1ab63f5c4f3cb69450044d07b45e5af72e1 (patch)
tree773c981b4357becfd3258719c1138e268508839a /drivers/net/ipvlan
parent8207f253a097fe15c93d85ac15ebb73c5e39e1e1 (diff)
downloadlinux-40b9d1ab63f5c4f3cb69450044d07b45e5af72e1.tar.xz
ipvlan: hold lower dev to avoid possible use-after-free
Recently syzkaller discovered the issue of disappearing lower device (NETDEV_UNREGISTER) while the virtual device (like macvlan) is still having it as a lower device. So it's just a matter of time similar discovery will be made for IPvlan device setup. So fixing it preemptively. Also while at it, add a refcount tracker. Fixes: 2ad7bf363841 ("ipvlan: Initial check-in of the IPVLAN driver.") Signed-off-by: Mahesh Bandewar <maheshb@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ipvlan')
-rw-r--r--drivers/net/ipvlan/ipvlan.h1
-rw-r--r--drivers/net/ipvlan/ipvlan_main.c2
2 files changed, 3 insertions, 0 deletions
diff --git a/drivers/net/ipvlan/ipvlan.h b/drivers/net/ipvlan/ipvlan.h
index de94921cbef9..025e0c19ec25 100644
--- a/drivers/net/ipvlan/ipvlan.h
+++ b/drivers/net/ipvlan/ipvlan.h
@@ -98,6 +98,7 @@ struct ipvl_port {
struct sk_buff_head backlog;
int count;
struct ida ida;
+ netdevice_tracker dev_tracker;
};
struct ipvl_skb_cb {
diff --git a/drivers/net/ipvlan/ipvlan_main.c b/drivers/net/ipvlan/ipvlan_main.c
index 54c94a69c2bb..796a38f9d7b2 100644
--- a/drivers/net/ipvlan/ipvlan_main.c
+++ b/drivers/net/ipvlan/ipvlan_main.c
@@ -83,6 +83,7 @@ static int ipvlan_port_create(struct net_device *dev)
if (err)
goto err;
+ netdev_hold(dev, &port->dev_tracker, GFP_KERNEL);
return 0;
err:
@@ -95,6 +96,7 @@ static void ipvlan_port_destroy(struct net_device *dev)
struct ipvl_port *port = ipvlan_port_get_rtnl(dev);
struct sk_buff *skb;
+ netdev_put(dev, &port->dev_tracker);
if (port->mode == IPVLAN_MODE_L3S)
ipvlan_l3s_unregister(port);
netdev_rx_handler_unregister(dev);