[Intel-wired-lan] [PATCH net v2] i40e: fix accessing vsi->active_filters without holding lock

[Intel-wired-lan] [PATCH net v2] i40e: fix accessing vsi->active_filters without holding lock

[Loktionov, Aleksandr]

From: Aleksandr Loktionov <aleksandr.loktionov@intel.com>

Fix accessing vsi->active_filters without holding the mac_filter_hash_lock.
Move vsi->active_filters = 0 inside critical section and
move clear_bit(__I40E_VSI_OVERFLOW_PROMISC, vsi->state) after the critical
section to ensure the new filters from other threads can be added only after
filters cleaning in the critical section is finished.

Fixes: 278e7d0b9d68 ("i40e: store MAC/VLAN filters in a hash with the MAC Address as key")
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
---
 drivers/net/ethernet/intel/i40e/i40e_main.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index d59b9a0..b1b781d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -13928,15 +13928,15 @@ static int i40e_add_vsi(struct i40e_vsi *vsi)
 		vsi->id = ctxt.vsi_number;
 	}
 
-	vsi->active_filters = 0;
-	clear_bit(__I40E_VSI_OVERFLOW_PROMISC, vsi->state);
 	spin_lock_bh(&vsi->mac_filter_hash_lock);
+	vsi->active_filters = 0;
 	/* If macvlan filters already exist, force them to get loaded */
 	hash_for_each_safe(vsi->mac_filter_hash, bkt, h, f, hlist) {
 		f->state = I40E_FILTER_NEW;
 		f_count++;
 	}
 	spin_unlock_bh(&vsi->mac_filter_hash_lock);
+	clear_bit(__I40E_VSI_OVERFLOW_PROMISC, vsi->state);
 
 	if (f_count) {
 		vsi->flags |= I40E_VSI_FLAG_FILTER_CHANGED;
-- 
2.31.1

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Re: [Intel-wired-lan] [PATCH net v2] i40e: fix accessing vsi->active_filters without holding lock

[Pucha, HimasekharX Reddy]

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@osuosl.org> On Behalf Of Loktionov, Aleksandr
> Sent: Friday, March 24, 2023 10:47 PM
> To: intel-wired-lan@lists.osuosl.org
> Cc: Loktionov, Aleksandr <aleksandr.loktionov@intel.com>
> Subject: [Intel-wired-lan] [PATCH net v2] i40e: fix accessing vsi->active_filters without holding lock
>
> From: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
>
> Fix accessing vsi->active_filters without holding the mac_filter_hash_lock.
> Move vsi->active_filters = 0 inside critical section and move clear_bit(__I40E_VSI_OVERFLOW_PROMISC, vsi->state) after the critical section to ensure the new filters from other threads can be added only after filters cleaning in the critical section is finished.
>
> Fixes: 278e7d0b9d68 ("i40e: store MAC/VLAN filters in a hash with the MAC Address as key")
> Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
> ---
>  drivers/net/ethernet/intel/i40e/i40e_main.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@intel.com> (A Contingent worker at Intel)
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