i40e: Fix macvlan leak by synchronizing access to mac_filter_hash

This patch addresses a macvlan leak issue in the i40e driver caused by
concurrent access to vsi->mac_filter_hash. The leak occurs when multiple
threads attempt to modify the mac_filter_hash simultaneously, leading to
inconsistent state and potential memory leaks.

To fix this, we now wrap the calls to i40e_del_mac_filter() and zeroing
vf->default_lan_addr.addr with spin_lock/unlock_bh(&vsi->mac_filter_hash_lock),
ensuring atomic operations and preventing concurrent access.

Additionally, we add lockdep_assert_held(&vsi->mac_filter_hash_lock) in
i40e_add_mac_filter() to help catch similar issues in the future.

Reproduction steps:
1. Spawn VFs and configure port vlan on them.
2. Trigger concurrent macvlan operations (e.g., adding and deleting
	portvlan and/or mac filters).
3. Observe the potential memory leak and inconsistent state in the
	mac_filter_hash.

This synchronization ensures the integrity of the mac_filter_hash and prevents
the described leak.

Fixes: fed0d9f13266 ("i40e: Fix VF's MAC Address change on VM")
Reviewed-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Tested-by: Rafal Romanowski <rafal.romanowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 03205eb9f925f3cf851976e5bc436cf24e2c5243..25295ae370b29c1245c45ac44d98f319fd3a7147 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -1734,6 +1734,7 @@ struct i40e_mac_filter *i40e_add_mac_filter(struct i40e_vsi *vsi,
        struct hlist_node *h;
        int bkt;
 
+       lockdep_assert_held(&vsi->mac_filter_hash_lock);
        if (vsi->info.pvid)
                return i40e_add_filter(vsi, macaddr,
                                       le16_to_cpu(vsi->info.pvid));

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 662622f01e31254ba2bea685bddc588d81d2de8b..dfa785e39458dbeea4e028b070d5f16246cd8b1a 100644 (file)
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -2213,8 +2213,10 @@ static int i40e_vc_get_vf_resources_msg(struct i40e_vf *vf, u8 *msg)
                vfres->vsi_res[0].qset_handle
                                          = le16_to_cpu(vsi->info.qs_handle[0]);
                if (!(vf->driver_caps & VIRTCHNL_VF_OFFLOAD_USO) && !vf->pf_set_mac) {
+                       spin_lock_bh(&vsi->mac_filter_hash_lock);
                        i40e_del_mac_filter(vsi, vf->default_lan_addr.addr);
                        eth_zero_addr(vf->default_lan_addr.addr);
+                       spin_unlock_bh(&vsi->mac_filter_hash_lock);
                }
                ether_addr_copy(vfres->vsi_res[0].default_mac_addr,
                                vf->default_lan_addr.addr);