From: Jason Gunthorpe <jgg@mellanox.com>
Date: Sun, 29 Jul 2018 11:34:59 +0300
Subject: IB/ipoib: Maintain the child_intfs list from ndo_init/uninit
Patch-mainline: v4.19-rc1
Git-commit: 13476d35bba60b59521ff25d902fdb552b8bf2ac
References: bsc#1103992 FATE#326009

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>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/ulp/ipoib/ipoib_main.c    |   16 ++++++++++++++++
 drivers/infiniband/ulp/ipoib/ipoib_netlink.c |   14 --------------
 drivers/infiniband/ulp/ipoib/ipoib_vlan.c    |   12 ------------
 3 files changed, 16 insertions(+), 26 deletions(-)

--- a/drivers/infiniband/ulp/ipoib/ipoib_main.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_main.c
@@ -1888,6 +1888,12 @@ static void ipoib_child_init(struct net_
 	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);
@@ -1957,6 +1963,16 @@ static void ipoib_ndo_uninit(struct net_
 		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)
--- a/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_netlink.c
@@ -133,19 +133,6 @@ static int ipoib_new_child_link(struct n
 	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_o
 	.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,
 };
--- a/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
+++ b/drivers/infiniband/ulp/ipoib/ipoib_vlan.c
@@ -106,8 +106,6 @@ int __ipoib_vlan_add(struct ipoib_dev_pr
 			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 *pd
 		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 *pd
 		free_netdev(ndev);
 
 out:
-	up_write(&ppriv->vlan_rwsem);
 	rtnl_unlock();
 
 	return result;
@@ -209,10 +201,6 @@ static void ipoib_vlan_delete_task(struc
 		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);
 	}