[dpdk-dev] [PATCH] net/ice: fix double free ACL flow entry

[dapengx.yu at intel.com]

From: Dapeng Yu <dapengx.yu at intel.com>

If call ice_flow_rem_entry() directly without checking entry_id, may
cause an ACL flow entry to be freed more than once.

This patch tries to find entry_id first, then call ice_flow_rem_entry()
to avoid the defect.

Fixes: 40d466fa9f76 ("net/ice: support ACL filter in DCF")
Cc: stable at dpdk.org

Signed-off-by: Dapeng Yu <dapengx.yu at intel.com>
---
 drivers/net/ice/ice_acl_filter.c | 33 +++++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 11 deletions(-)

diff --git a/drivers/net/ice/ice_acl_filter.c b/drivers/net/ice/ice_acl_filter.c
index 0c15a7036c..f44ce5d77e 100644
--- a/drivers/net/ice/ice_acl_filter.c
+++ b/drivers/net/ice/ice_acl_filter.c
@@ -45,7 +45,7 @@ static struct ice_flow_parser ice_acl_parser;
 
 struct acl_rule {
 	enum ice_fltr_ptype flow_type;
-	uint32_t entry_id[4];
+	uint64_t entry_id[4];
 };
 
 static struct
@@ -440,7 +440,7 @@ ice_acl_hw_set_conf(struct ice_pf *pf, struct ice_fdir_fltr *input,
 			PMD_DRV_LOG(ERR, "Fail to add entry.");
 			return ret;
 		}
-		rule->entry_id[entry_idx] = slot_id;
+		rule->entry_id[entry_idx] = entry_id;
 		pf->acl.hw_entry_id[slot_id] = hw_entry;
 	} else {
 		PMD_DRV_LOG(ERR, "Exceed the maximum entry number(%d)"
@@ -451,18 +451,28 @@ ice_acl_hw_set_conf(struct ice_pf *pf, struct ice_fdir_fltr *input,
 	return 0;
 }
 
+static inline void
+ice_acl_del_entry(struct ice_hw *hw, uint64_t entry_id)
+{
+	uint64_t hw_entry;
+
+	hw_entry = ice_flow_find_entry(hw, ICE_BLK_ACL, entry_id);
+	ice_flow_rem_entry(hw, ICE_BLK_ACL, hw_entry);
+}
+
 static inline void
 ice_acl_hw_rem_conf(struct ice_pf *pf, struct acl_rule *rule, int32_t entry_idx)
 {
 	uint32_t slot_id;
 	int32_t i;
+	uint64_t entry_id;
 	struct ice_hw *hw = ICE_PF_TO_HW(pf);
 
 	for (i = 0; i < entry_idx; i++) {
-		slot_id = rule->entry_id[i];
+		entry_id = rule->entry_id[i];
+		slot_id = ICE_LO_DWORD(entry_id);
 		rte_bitmap_set(pf->acl.slots, slot_id);
-		ice_flow_rem_entry(hw, ICE_BLK_ACL,
-				   pf->acl.hw_entry_id[slot_id]);
+		ice_acl_del_entry(hw, entry_id);
 	}
 }
 
@@ -562,6 +572,7 @@ ice_acl_destroy_filter(struct ice_adapter *ad,
 {
 	struct acl_rule *rule = (struct acl_rule *)flow->rule;
 	uint32_t slot_id, i;
+	uint64_t entry_id;
 	struct ice_pf *pf = &ad->pf;
 	struct ice_hw *hw = ICE_PF_TO_HW(pf);
 	int ret = 0;
@@ -569,19 +580,19 @@ ice_acl_destroy_filter(struct ice_adapter *ad,
 	switch (rule->flow_type) {
 	case ICE_FLTR_PTYPE_NONF_IPV4_OTHER:
 		for (i = 0; i < 4; i++) {
-			slot_id = rule->entry_id[i];
+			entry_id = rule->entry_id[i];
+			slot_id = ICE_LO_DWORD(entry_id);
 			rte_bitmap_set(pf->acl.slots, slot_id);
-			ice_flow_rem_entry(hw, ICE_BLK_ACL,
-					   pf->acl.hw_entry_id[slot_id]);
+			ice_acl_del_entry(hw, entry_id);
 		}
 		break;
 	case ICE_FLTR_PTYPE_NONF_IPV4_UDP:
 	case ICE_FLTR_PTYPE_NONF_IPV4_TCP:
 	case ICE_FLTR_PTYPE_NONF_IPV4_SCTP:
-		slot_id = rule->entry_id[0];
+		entry_id = rule->entry_id[0];
+		slot_id = ICE_LO_DWORD(entry_id);
 		rte_bitmap_set(pf->acl.slots, slot_id);
-		ice_flow_rem_entry(hw, ICE_BLK_ACL,
-				   pf->acl.hw_entry_id[slot_id]);
+		ice_acl_del_entry(hw, entry_id);
 		break;
 	default:
 		rte_flow_error_set(error, EINVAL,
-- 
2.27.0