linux-kernel - [PATCH 5.18 27/88] ice: Fix max VLANs available for VF

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Date:   Mon,  1 Aug 2022 13:46:41 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Przemyslaw Patynowski <przemyslawx.patynowski@...el.com>,
        Mateusz Palczewski <mateusz.palczewski@...el.com>,
        Marek Szlosek <marek.szlosek@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>
Subject: [PATCH 5.18 27/88] ice: Fix max VLANs available for VF

From: Przemyslaw Patynowski <przemyslawx.patynowski@...el.com>

commit 1e308c6fb7127371f48a0fb9770ea0b30a6b5698 upstream.

Legacy VLAN implementation allows for untrusted VF to have 8 VLAN
filters, not counting VLAN 0 filters. Current VLAN_V2 implementation
lowers available filters for VF, by counting in VLAN 0 filter for both
TPIDs.
Fix this by counting only non zero VLAN filters.
Without this patch, untrusted VF would not be able to access 8 VLAN
filters.

Fixes: cc71de8fa133 ("ice: Add support for VIRTCHNL_VF_OFFLOAD_VLAN_V2")
Signed-off-by: Przemyslaw Patynowski <przemyslawx.patynowski@...el.com>
Signed-off-by: Mateusz Palczewski <mateusz.palczewski@...el.com>
Tested-by: Marek Szlosek <marek.szlosek@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ethernet/intel/ice/ice_virtchnl.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/net/ethernet/intel/ice/ice_virtchnl.c
+++ b/drivers/net/ethernet/intel/ice/ice_virtchnl.c
@@ -2966,7 +2966,8 @@ ice_vc_validate_add_vlan_filter_list(str
 				     struct virtchnl_vlan_filtering_caps *vfc,
 				     struct virtchnl_vlan_filter_list_v2 *vfl)
 {
-	u16 num_requested_filters = vsi->num_vlan + vfl->num_elements;
+	u16 num_requested_filters = ice_vsi_num_non_zero_vlans(vsi) +
+		vfl->num_elements;
 
 	if (num_requested_filters > vfc->max_filters)
 		return false;