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IB/ipoib: Maintain the child_intfs list from ndo_init/uninit

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This fixes a bug in the netlink path where the vlan_rwsem was not
held around __ipoib_vlan_add causing the child_intfs to be manipulated
unsafely.

In the process this greatly simplifies the vlan_rwsem write side locking
to only cover a single non-sleeping statement.

This also further increases the safety of the removal ordering by holding
the netdev of the parent while the child is active to ensure most bugs
become either an oops on a NULL priv or a deadlock on the netdev refcount.

Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
This commit is contained in:
Jason Gunthorpe 2018-07-29 11:34:59 +03:00
parent 25405d98a2
commit 13476d35bb
3 changed files with 16 additions and 26 deletions
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16
drivers/infiniband/ulp/ipoib/ipoib_main.c
View file

@ -1890,6 +1890,12 @@ static void ipoib_child_init(struct net_device *ndev)
struct ipoib_dev_priv *priv = ipoib_priv(ndev);
struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
dev_hold(priv->parent);
down_write(&ppriv->vlan_rwsem);
list_add_tail(&priv->list, &ppriv->child_intfs);
up_write(&ppriv->vlan_rwsem);
priv->max_ib_mtu = ppriv->max_ib_mtu;
set_bit(IPOIB_FLAG_SUBINTERFACE, &priv->flags);
memcpy(priv->dev->dev_addr, ppriv->dev->dev_addr, INFINIBAND_ALEN);
@ -1959,6 +1965,16 @@ static void ipoib_ndo_uninit(struct net_device *dev)
destroy_workqueue(priv->wq);
priv->wq = NULL;
}
if (priv->parent) {
struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
down_write(&ppriv->vlan_rwsem);
list_del(&priv->list);
up_write(&ppriv->vlan_rwsem);
dev_put(priv->parent);
}
}
static int ipoib_set_vf_link_state(struct net_device *dev, int vf, int link_state)

14
drivers/infiniband/ulp/ipoib/ipoib_netlink.c
View file

@ -133,19 +133,6 @@ static int ipoib_new_child_link(struct net *src_net, struct net_device *dev,
return err;
}
static void ipoib_unregister_child_dev(struct net_device *dev, struct list_head *head)
{
struct ipoib_dev_priv *priv, *ppriv;
priv = ipoib_priv(dev);
ppriv = ipoib_priv(priv->parent);
down_write(&ppriv->vlan_rwsem);
unregister_netdevice_queue(dev, head);
list_del(&priv->list);
up_write(&ppriv->vlan_rwsem);
}
static size_t ipoib_get_size(const struct net_device *dev)
{
return nla_total_size(2) + /* IFLA_IPOIB_PKEY */
@ -161,7 +148,6 @@ static struct rtnl_link_ops ipoib_link_ops __read_mostly = {
.setup = ipoib_setup_common,
.newlink = ipoib_new_child_link,
.changelink = ipoib_changelink,
.dellink = ipoib_unregister_child_dev,
.get_size = ipoib_get_size,
.fill_info = ipoib_fill_info,
};

12
drivers/infiniband/ulp/ipoib/ipoib_vlan.c
View file

@ -106,8 +106,6 @@ int __ipoib_vlan_add(struct ipoib_dev_priv *ppriv, struct ipoib_dev_priv *priv,
goto sysfs_failed;
}
list_add_tail(&priv->list, &ppriv->child_intfs);
return 0;
sysfs_failed:
@ -139,11 +137,6 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
return -EPERM;
}
if (!down_write_trylock(&ppriv->vlan_rwsem)) {
rtnl_unlock();
return restart_syscall();
}
/*
* First ensure this isn't a duplicate. We check the parent device and
* then all of the legacy child interfaces to make sure the Pkey
@ -175,7 +168,6 @@ int ipoib_vlan_add(struct net_device *pdev, unsigned short pkey)
free_netdev(ndev);
out:
up_write(&ppriv->vlan_rwsem);
rtnl_unlock();
return result;
@ -209,10 +201,6 @@ static void ipoib_vlan_delete_task(struct work_struct *work)
struct ipoib_dev_priv *priv = ipoib_priv(dev);
struct ipoib_dev_priv *ppriv = ipoib_priv(priv->parent);
down_write(&ppriv->vlan_rwsem);
list_del(&priv->list);
up_write(&ppriv->vlan_rwsem);
ipoib_dbg(ppriv, "delete child vlan %s\n", dev->name);
unregister_netdevice(dev);
}