netdev - [PATCH net 4/4] i40e: Fix filter input checks to prevent config with invalid values

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Date: Wed, 27 Dec 2023 10:25:33 -0800
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: Sudheer Mogilappagari <sudheer.mogilappagari@...el.com>,
	anthony.l.nguyen@...el.com,
	Andrii Staikov <andrii.staikov@...el.com>,
	Aleksandr Loktionov <aleksandr.loktionov@...el.com>,
	Simon Horman <horms@...nel.org>,
	Bharathi Sreenivas <bharathi.sreenivas@...el.com>
Subject: [PATCH net 4/4] i40e: Fix filter input checks to prevent config with invalid values

From: Sudheer Mogilappagari <sudheer.mogilappagari@...el.com>

Prevent VF from configuring filters with unsupported actions or use
REDIRECT action with invalid tc number. Current checks could cause
out of bounds access on PF side.

Fixes: e284fc280473 ("i40e: Add and delete cloud filter")
Reviewed-by: Andrii Staikov <andrii.staikov@...el.com>
Signed-off-by: Sudheer Mogilappagari <sudheer.mogilappagari@...el.com>
Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@...el.com>
Reviewed-by: Simon Horman <horms@...nel.org>
Tested-by: Bharathi Sreenivas <bharathi.sreenivas@...el.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@...el.com>
---
 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
index 3f99eb198245..031b15cceab9 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c
@@ -3521,16 +3521,16 @@ static int i40e_validate_cloud_filter(struct i40e_vf *vf,
 	bool found = false;
 	int bkt;
 
-	if (!tc_filter->action) {
+	if (tc_filter->action != VIRTCHNL_ACTION_TC_REDIRECT) {
 		dev_info(&pf->pdev->dev,
-			 "VF %d: Currently ADq doesn't support Drop Action\n",
-			 vf->vf_id);
+			 "VF %d: ADQ doesn't support this action (%d)\n",
+			 vf->vf_id, tc_filter->action);
 		goto err;
 	}
 
 	/* action_meta is TC number here to which the filter is applied */
 	if (!tc_filter->action_meta ||
-	    tc_filter->action_meta > I40E_MAX_VF_VSI) {
+	    tc_filter->action_meta > vf->num_tc) {
 		dev_info(&pf->pdev->dev, "VF %d: Invalid TC number %u\n",
 			 vf->vf_id, tc_filter->action_meta);
 		goto err;
-- 
2.41.0