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[SRU,F:linux-bluefield,14/32] bonding: deal with xfrm state in all modes and add more error-checking

Message ID 1620070757-51528-15-git-send-email-danielj@nvidia.com
State New
Headers show
Series TLS Bonding Backport | expand

Commit Message

Daniel Jurgens May 3, 2021, 7:38 p.m. UTC 
From: Jarod Wilson <jarod@redhat.com>

BugLink: https://bugs.launchpad.net/bugs/1926994

It's possible that device removal happens when the bond is in non-AB mode,
and addition happens in AB mode, so bond_ipsec_del_sa() never gets called,
which leaves security associations in an odd state if bond_ipsec_add_sa()
then gets called after switching the bond into AB. Just call add and
delete universally for all modes to keep things consistent.

However, it's also possible that this code gets called when the system is
shutting down, and the xfrm subsystem has already been disconnected from
the bond device, so we need to do some error-checking and bail, lest we
hit a null ptr deref.

Fixes: a3b658cfb664 ("bonding: allow xfrm offload setup post-module-load")
CC: Huy Nguyen <huyn@mellanox.com>
CC: Saeed Mahameed <saeedm@mellanox.com>
CC: Jay Vosburgh <j.vosburgh@gmail.com>
CC: Veaceslav Falico <vfalico@gmail.com>
CC: Andy Gospodarek <andy@greyhouse.net>
CC: "David S. Miller" <davem@davemloft.net>
CC: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
CC: Jakub Kicinski <kuba@kernel.org>
CC: Steffen Klassert <steffen.klassert@secunet.com>
CC: Herbert Xu <herbert@gondor.apana.org.au>
CC: netdev@vger.kernel.org
CC: intel-wired-lan@lists.osuosl.org
Signed-off-by: Jarod Wilson <jarod@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
(cherry picked from commit 5cd24cbe7dca62089ac6228f1dd14729d7da6ed8)
Signed-off-by: Daniel Jurgens <danielj@nvidia.com>
---
 drivers/net/bonding/bond_main.c | 39 +++++++++++++++++++++++++--------------
 1 file changed, 25 insertions(+), 14 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/bonding/bond_main.c b/drivers/net/bonding/bond_main.c
index dc49fc8..8f173ec 100644
--- a/drivers/net/bonding/bond_main.c
+++ b/drivers/net/bonding/bond_main.c
@@ -336,9 +336,14 @@  static int bond_vlan_rx_kill_vid(struct net_device *bond_dev,
 static int bond_ipsec_add_sa(struct xfrm_state *xs)
 {
 	struct net_device *bond_dev = xs->xso.dev;
-	struct bonding *bond = netdev_priv(bond_dev);
-	struct slave *slave = rtnl_dereference(bond->curr_active_slave);
+	struct bonding *bond;
+	struct slave *slave;
 
+	if (!bond_dev)
+		return -EINVAL;
+
+	bond = netdev_priv(bond_dev);
+	slave = rtnl_dereference(bond->curr_active_slave);
 	xs->xso.real_dev = slave->dev;
 	bond->xs = xs;
 
@@ -358,8 +363,14 @@  static int bond_ipsec_add_sa(struct xfrm_state *xs)
 static void bond_ipsec_del_sa(struct xfrm_state *xs)
 {
 	struct net_device *bond_dev = xs->xso.dev;
-	struct bonding *bond = netdev_priv(bond_dev);
-	struct slave *slave = rtnl_dereference(bond->curr_active_slave);
+	struct bonding *bond;
+	struct slave *slave;
+
+	if (!bond_dev)
+		return;
+
+	bond = netdev_priv(bond_dev);
+	slave = rtnl_dereference(bond->curr_active_slave);
 
 	if (!slave)
 		return;
@@ -913,12 +924,12 @@  void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 	if (old_active == new_active)
 		return;
 
-	if (new_active) {
 #ifdef CONFIG_XFRM_OFFLOAD
-		if ((BOND_MODE(bond) == BOND_MODE_ACTIVEBACKUP) && bond->xs)
-			bond_ipsec_del_sa(bond->xs);
+	if (old_active && bond->xs)
+		bond_ipsec_del_sa(bond->xs);
 #endif /* CONFIG_XFRM_OFFLOAD */
 
+	if (new_active) {
 		new_active->last_link_up = jiffies;
 
 		if (new_active->link == BOND_LINK_BACK) {
@@ -981,13 +992,6 @@  void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 					bond_should_notify_peers(bond);
 			}
 
-#ifdef CONFIG_XFRM_OFFLOAD
-			if (old_active && bond->xs) {
-				xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
-				bond_ipsec_add_sa(bond->xs);
-			}
-#endif /* CONFIG_XFRM_OFFLOAD */
-
 			call_netdevice_notifiers(NETDEV_BONDING_FAILOVER, bond->dev);
 			if (should_notify_peers) {
 				bond->send_peer_notif--;
@@ -997,6 +1001,13 @@  void bond_change_active_slave(struct bonding *bond, struct slave *new_active)
 		}
 	}
 
+#ifdef CONFIG_XFRM_OFFLOAD
+	if (new_active && bond->xs) {
+		xfrm_dev_state_flush(dev_net(bond->dev), bond->dev, true);
+		bond_ipsec_add_sa(bond->xs);
+	}
+#endif /* CONFIG_XFRM_OFFLOAD */
+
 	/* resend IGMP joins since active slave has changed or
 	 * all were sent on curr_active_slave.
 	 * resend only if bond is brought up with the affected