netdev - [PATCH net] i40e: Fix VF MAC filter removal

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Message-ID: <20240329180638.211412-1-anthony.l.nguyen@intel.com>
Date: Fri, 29 Mar 2024 11:06:37 -0700
From: Tony Nguyen <anthony.l.nguyen@...el.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	pabeni@...hat.com,
	edumazet@...gle.com,
	netdev@...r.kernel.org
Cc: Ivan Vecera <ivecera@...hat.com>,
	anthony.l.nguyen@...el.com,
	horms@...nel.org,
	Michal Schmidt <mschmidt@...hat.com>,
	Brett Creeley <brett.creeley@....com>,
	Rafal Romanowski <rafal.romanowski@...el.com>
Subject: [PATCH net] i40e: Fix VF MAC filter removal

From: Ivan Vecera <ivecera@...hat.com>

Commit 73d9629e1c8c ("i40e: Do not allow untrusted VF to remove
administratively set MAC") fixed an issue where untrusted VF was
allowed to remove its own MAC address although this was assigned
administratively from PF. Unfortunately the introduced check
is wrong because it causes that MAC filters for other MAC addresses
including multi-cast ones are not removed.

<snip>
	if (ether_addr_equal(addr, vf->default_lan_addr.addr) &&
	    i40e_can_vf_change_mac(vf))
		was_unimac_deleted = true;
	else
		continue;

	if (i40e_del_mac_filter(vsi, al->list[i].addr)) {
	...
</snip>

The else path with `continue` effectively skips any MAC filter
removal except one for primary MAC addr when VF is allowed to do so.
Fix the check condition so the `continue` is only done for primary
MAC address.

Fixes: 73d9629e1c8c ("i40e: Do not allow untrusted VF to remove administratively set MAC")
Signed-off-by: Ivan Vecera <ivecera@...hat.com>
Reviewed-by: Michal Schmidt <mschmidt@...hat.com>
Reviewed-by: Brett Creeley <brett.creeley@....com>
Tested-by: Rafal Romanowski <rafal.romanowski@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 83a34e98bdc7..4efcee7e6feb 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -3139,11 +3139,12 @@ static int i40e_vc_del_mac_addr_msg(struct i40e_vf *vf, u8 *msg)
 		/* Allow to delete VF primary MAC only if it was not set
 		 * administratively by PF or if VF is trusted.
 		 */
-		if (ether_addr_equal(addr, vf->default_lan_addr.addr) &&
-		    i40e_can_vf_change_mac(vf))
-			was_unimac_deleted = true;
-		else
-			continue;
+		if (ether_addr_equal(addr, vf->default_lan_addr.addr)) {
+			if (i40e_can_vf_change_mac(vf))
+				was_unimac_deleted = true;
+			else
+				continue;
+		}
 
 		if (i40e_del_mac_filter(vsi, al->list[i].addr)) {
 			ret = -EINVAL;
-- 
2.41.0