dev_net(dev) is the netns of the device and xi->net is the link netns,
where the device has been linked.
changelink() must operate in the link netns to avoid a corruption of
the xfrm lists.
Note that xi->net and dev_net(xi->physdev) are always the same.
Before the patch, the xfrmi lists may be corrupted and can later trigger a
kernel panic.
Fixes: f203b76d7809 ("xfrm: Add virtual xfrm interfaces")
Reported-by: Julien Floret <[email protected]>
Signed-off-by: Nicolas Dichtel <[email protected]>
Tested-by: Julien Floret <[email protected]>
---
net/xfrm/xfrm_interface.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/net/xfrm/xfrm_interface.c b/net/xfrm/xfrm_interface.c
index a60d391f7ebe..9c5bc8dcf608 100644
--- a/net/xfrm/xfrm_interface.c
+++ b/net/xfrm/xfrm_interface.c
@@ -503,7 +503,7 @@ static int xfrmi_change(struct xfrm_if *xi, const struct
xfrm_if_parms *p)
static int xfrmi_update(struct xfrm_if *xi, struct xfrm_if_parms *p)
{
- struct net *net = dev_net(xi->dev);
+ struct net *net = xi->net;
struct xfrmi_net *xfrmn = net_generic(net, xfrmi_net_id);
int err;
@@ -663,9 +663,9 @@ static int xfrmi_changelink(struct net_device *dev, struct
nlattr *tb[],
struct nlattr *data[],
struct netlink_ext_ack *extack)
{
- struct net *net = dev_net(dev);
+ struct xfrm_if *xi = netdev_priv(dev);
+ struct net *net = xi->net;
struct xfrm_if_parms p;
- struct xfrm_if *xi;
xfrmi_netlink_parms(data, &p);
xi = xfrmi_locate(net, &p);
@@ -707,7 +707,7 @@ static struct net *xfrmi_get_link_net(const struct
net_device *dev)
{
struct xfrm_if *xi = netdev_priv(dev);
- return dev_net(xi->phydev);
+ return xi->net;
}
static const struct nla_policy xfrmi_policy[IFLA_XFRM_MAX + 1] = {
--
2.21.0
