[PATCH] staging: rtl8723bs: use kfree_sensitive() for key material

[Ivy Lopez <skunkolee@gmail.com>]

The set_stakey_parm struct contains a 16-byte encryption key.
Use kfree_sensitive() instead of kfree() to ensure the key
material is zeroed before the memory is freed, preventing
potential information leaks.

Signed-off-by: Ivy Lopez <skunkolee@gmail.com>
---
 drivers/net/ethernet/faraday/ftmac100.c  | 47 +++++-------------------
 drivers/staging/rtl8723bs/core/rtw_cmd.c |  8 ++--
 2 files changed, 13 insertions(+), 42 deletions(-)

diff --git a/drivers/net/ethernet/faraday/ftmac100.c b/drivers/net/ethernet/faraday/ftmac100.c
index 5803a382f0ba..adb318925f44 100644
--- a/drivers/net/ethernet/faraday/ftmac100.c
+++ b/drivers/net/ethernet/faraday/ftmac100.c
@@ -49,7 +49,6 @@ struct ftmac100_descs {
 };
 
 struct ftmac100 {
-	struct resource *res;
 	void __iomem *base;
 	int irq;
 
@@ -1137,11 +1136,9 @@ static int ftmac100_probe(struct platform_device *pdev)
 		return irq;
 
 	/* setup net_device */
-	netdev = alloc_etherdev(sizeof(*priv));
-	if (!netdev) {
-		err = -ENOMEM;
-		goto err_alloc_etherdev;
-	}
+	netdev = devm_alloc_etherdev(&pdev->dev, sizeof(*priv));
+	if (!netdev)
+		return -ENOMEM;
 
 	SET_NETDEV_DEV(netdev, &pdev->dev);
 	netdev->ethtool_ops = &ftmac100_ethtool_ops;
@@ -1150,7 +1147,7 @@ static int ftmac100_probe(struct platform_device *pdev)
 
 	err = platform_get_ethdev_address(&pdev->dev, netdev);
 	if (err == -EPROBE_DEFER)
-		goto defer_get_mac;
+		return err;
 
 	platform_set_drvdata(pdev, netdev);
 
@@ -1165,20 +1162,9 @@ static int ftmac100_probe(struct platform_device *pdev)
 	netif_napi_add(netdev, &priv->napi, ftmac100_poll);
 
 	/* map io memory */
-	priv->res = request_mem_region(res->start, resource_size(res),
-				       dev_name(&pdev->dev));
-	if (!priv->res) {
-		dev_err(&pdev->dev, "Could not reserve memory region\n");
-		err = -ENOMEM;
-		goto err_req_mem;
-	}
-
-	priv->base = ioremap(res->start, resource_size(res));
-	if (!priv->base) {
-		dev_err(&pdev->dev, "Failed to ioremap ethernet registers\n");
-		err = -EIO;
-		goto err_ioremap;
-	}
+	priv->base = devm_platform_ioremap_resource(pdev, 0);
+	if (IS_ERR(priv->base))
+		return PTR_ERR(priv->base);
 
 	priv->irq = irq;
 
@@ -1208,32 +1194,17 @@ static int ftmac100_probe(struct platform_device *pdev)
 	return 0;
 
 err_register_netdev:
-	iounmap(priv->base);
-err_ioremap:
-	release_resource(priv->res);
-err_req_mem:
 	netif_napi_del(&priv->napi);
-defer_get_mac:
-	free_netdev(netdev);
-err_alloc_etherdev:
 	return err;
 }
 
 static void ftmac100_remove(struct platform_device *pdev)
 {
-	struct net_device *netdev;
-	struct ftmac100 *priv;
-
-	netdev = platform_get_drvdata(pdev);
-	priv = netdev_priv(netdev);
+	struct net_device *netdev = platform_get_drvdata(pdev);
+	struct ftmac100 *priv = netdev_priv(netdev);
 
 	unregister_netdev(netdev);
-
-	iounmap(priv->base);
-	release_resource(priv->res);
-
 	netif_napi_del(&priv->napi);
-	free_netdev(netdev);
 }
 
 static const struct of_device_id ftmac100_of_ids[] = {
diff --git a/drivers/staging/rtl8723bs/core/rtw_cmd.c b/drivers/staging/rtl8723bs/core/rtw_cmd.c
index b932670f5d63..a34ee407285b 100644
--- a/drivers/staging/rtl8723bs/core/rtw_cmd.c
+++ b/drivers/staging/rtl8723bs/core/rtw_cmd.c
@@ -899,7 +899,7 @@ u8 rtw_setstakey_cmd(struct adapter *padapter, struct sta_info *sta, u8 unicast_
 	if (enqueue) {
 		ph2c = kzalloc_obj(*ph2c);
 		if (!ph2c) {
-			kfree(psetstakey_para);
+			kfree_sensitive(psetstakey_para);
 			res = _FAIL;
 			goto exit;
 		}
@@ -907,7 +907,7 @@ u8 rtw_setstakey_cmd(struct adapter *padapter, struct sta_info *sta, u8 unicast_
 		psetstakey_rsp = kzalloc_obj(*psetstakey_rsp);
 		if (!psetstakey_rsp) {
 			kfree(ph2c);
-			kfree(psetstakey_para);
+			kfree_sensitive(psetstakey_para);
 			res = _FAIL;
 			goto exit;
 		}
@@ -918,7 +918,7 @@ u8 rtw_setstakey_cmd(struct adapter *padapter, struct sta_info *sta, u8 unicast_
 		res = rtw_enqueue_cmd(pcmdpriv, ph2c);
 	} else {
 		set_stakey_hdl(padapter, (u8 *)psetstakey_para);
-		kfree(psetstakey_para);
+		kfree_sensitive(psetstakey_para);
 	}
 exit:
 	return res;
@@ -958,7 +958,7 @@ u8 rtw_clearstakey_cmd(struct adapter *padapter, struct sta_info *sta, u8 enqueu
 		psetstakey_rsp = kzalloc_obj(*psetstakey_rsp);
 		if (!psetstakey_rsp) {
 			kfree(ph2c);
-			kfree(psetstakey_para);
+			kfree_sensitive(psetstakey_para);
 			res = _FAIL;
 			goto exit;
 		}
-- 
2.55.0