net: hns3: add vlan list lock to protect vlan list

When adding port base VLAN, vf VLAN need to remove from HW and modify
the vlan state in vf VLAN list as false. If the periodicity task is
freeing the same node, it may cause "use after free" error.
This patch adds a vlan list lock to protect the vlan list.

Fixes: c6075b1 ("net: hns3: Record VF vlan tables")
Signed-off-by: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Guangbin Huang <huangguangbin2@huawei.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.c

@@ -9818,19 +9818,28 @@ static void hclge_add_vport_vlan_table(struct hclge_vport *vport, u16 vlan_id,
 				       bool writen_to_tbl)
 {
 	struct hclge_vport_vlan_cfg *vlan, *tmp;
+	struct hclge_dev *hdev = vport->back;
 
-	list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node)
-		if (vlan->vlan_id == vlan_id)
+	mutex_lock(&hdev->vport_lock);
+
+	list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node) {
+		if (vlan->vlan_id == vlan_id) {
+			mutex_unlock(&hdev->vport_lock);
 			return;
+		}
+	}
 
 	vlan = kzalloc(sizeof(*vlan), GFP_KERNEL);
-	if (!vlan)
+	if (!vlan) {
+		mutex_unlock(&hdev->vport_lock);
 		return;
+	}
 
 	vlan->hd_tbl_status = writen_to_tbl;
 	vlan->vlan_id = vlan_id;
 
 	list_add_tail(&vlan->node, &vport->vlan_list);
+	mutex_unlock(&hdev->vport_lock);
 }
 
 static int hclge_add_vport_all_vlan_table(struct hclge_vport *vport)
@@ -9839,6 +9848,8 @@ static int hclge_add_vport_all_vlan_table(struct hclge_vport *vport)
 	struct hclge_dev *hdev = vport->back;
 	int ret;
 
+	mutex_lock(&hdev->vport_lock);
+
 	list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node) {
 		if (!vlan->hd_tbl_status) {
 			ret = hclge_set_vlan_filter_hw(hdev, htons(ETH_P_8021Q),
@@ -9848,12 +9859,16 @@ static int hclge_add_vport_all_vlan_table(struct hclge_vport *vport)
 				dev_err(&hdev->pdev->dev,
 					"restore vport vlan list failed, ret=%d\n",
 					ret);
+
+				mutex_unlock(&hdev->vport_lock);
 				return ret;
 			}
 		}
 		vlan->hd_tbl_status = true;
 	}
 
+	mutex_unlock(&hdev->vport_lock);
+
 	return 0;
 }
 
@@ -9863,6 +9878,8 @@ static void hclge_rm_vport_vlan_table(struct hclge_vport *vport, u16 vlan_id,
 	struct hclge_vport_vlan_cfg *vlan, *tmp;
 	struct hclge_dev *hdev = vport->back;
 
+	mutex_lock(&hdev->vport_lock);
+
 	list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node) {
 		if (vlan->vlan_id == vlan_id) {
 			if (is_write_tbl && vlan->hd_tbl_status)
@@ -9877,13 +9894,17 @@ static void hclge_rm_vport_vlan_table(struct hclge_vport *vport, u16 vlan_id,
 			break;
 		}
 	}
+
+	mutex_unlock(&hdev->vport_lock);
 }
 
 void hclge_rm_vport_all_vlan_table(struct hclge_vport *vport, bool is_del_list)
 {
 	struct hclge_vport_vlan_cfg *vlan, *tmp;
 	struct hclge_dev *hdev = vport->back;
 
+	mutex_lock(&hdev->vport_lock);
+
 	list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node) {
 		if (vlan->hd_tbl_status)
 			hclge_set_vlan_filter_hw(hdev,
@@ -9899,6 +9920,7 @@ void hclge_rm_vport_all_vlan_table(struct hclge_vport *vport, bool is_del_list)
 		}
 	}
 	clear_bit(vport->vport_id, hdev->vf_vlan_full);
+	mutex_unlock(&hdev->vport_lock);
 }
 
 void hclge_uninit_vport_vlan_table(struct hclge_dev *hdev)
@@ -9907,13 +9929,17 @@ void hclge_uninit_vport_vlan_table(struct hclge_dev *hdev)
 	struct hclge_vport *vport;
 	int i;
 
+	mutex_lock(&hdev->vport_lock);
+
 	for (i = 0; i < hdev->num_alloc_vport; i++) {
 		vport = &hdev->vport[i];
 		list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node) {
 			list_del(&vlan->node);
 			kfree(vlan);
 		}
 	}
+
+	mutex_unlock(&hdev->vport_lock);
 }
 
 void hclge_restore_vport_port_base_vlan_config(struct hclge_dev *hdev)
@@ -9953,6 +9979,8 @@ void hclge_restore_vport_vlan_table(struct hclge_vport *vport)
 	struct hclge_dev *hdev = vport->back;
 	int ret;
 
+	mutex_lock(&hdev->vport_lock);
+
 	if (vport->port_base_vlan_cfg.state == HNAE3_PORT_BASE_VLAN_DISABLE) {
 		list_for_each_entry_safe(vlan, tmp, &vport->vlan_list, node) {
 			ret = hclge_set_vlan_filter_hw(hdev, htons(ETH_P_8021Q),
@@ -9963,6 +9991,8 @@ void hclge_restore_vport_vlan_table(struct hclge_vport *vport)
 			vlan->hd_tbl_status = true;
 		}
 	}
+
+	mutex_unlock(&hdev->vport_lock);
 }
 
 /* For global reset and imp reset, hardware will clear the mac table,
@@ -11861,8 +11891,8 @@ static void hclge_uninit_ae_dev(struct hnae3_ae_dev *ae_dev)
 	hclge_misc_irq_uninit(hdev);
 	hclge_devlink_uninit(hdev);
 	hclge_pci_uninit(hdev);
-	mutex_destroy(&hdev->vport_lock);
 	hclge_uninit_vport_vlan_table(hdev);
+	mutex_destroy(&hdev->vport_lock);
 	ae_dev->priv = NULL;
 }
 

drivers/net/ethernet/hisilicon/hns3/hns3pf/hclge_main.h

@@ -1033,6 +1033,7 @@ struct hclge_vport {
 	spinlock_t mac_list_lock; /* protect mac address need to add/detele */
 	struct list_head uc_mac_list;   /* Store VF unicast table */
 	struct list_head mc_mac_list;   /* Store VF multicast table */
+
 	struct list_head vlan_list;     /* Store VF vlan table */
 };