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xfrm interface: fix list corruption for x-netns 

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: f203b76d78 ("xfrm: Add virtual xfrm interfaces")
Reported-by: Julien Floret <julien.floret@6wind.com>
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Tested-by: Julien Floret <julien.floret@6wind.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
This commit is contained in:
Nicolas Dichtel 2019-07-15 12:00:22 +02:00 committed by Steffen Klassert
parent e0aaa332e6
commit c5d1030f23
1 changed files with 4 additions and 4 deletions
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8
net/xfrm/xfrm_interface.c
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@ -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] = {