linux-kernel - [PATCH net v2] gianfar: ethtool: Fix refcount leak in gfar_get_ts

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Message-Id: <20220310015313.14938-1-linmq006@gmail.com>
Date:   Thu, 10 Mar 2022 01:53:13 +0000
From:   Miaoqian Lin <linmq006@...il.com>
To:     Claudiu Manoil <claudiu.manoil@....com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Yangbo Lu <yangbo.lu@....com>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     linmq006@...il.com
Subject: [PATCH net v2] gianfar: ethtool: Fix refcount leak in gfar_get_ts_info

The of_find_compatible_node() function returns a node pointer with
refcount incremented, We should use of_node_put() on it when done
Add the missing of_node_put() to release the refcount.

Fixes: 7349a74ea75c ("net: ethernet: gianfar_ethtool: get phc index through drvdata")
Signed-off-by: Miaoqian Lin <linmq006@...il.com>
Reviewed-by: Jesse Brandeburg <jesse.brandeburg@...el.com>
---
changes in v2:
- Fix the subject
---
 drivers/net/ethernet/freescale/gianfar_ethtool.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/net/ethernet/freescale/gianfar_ethtool.c b/drivers/net/ethernet/freescale/gianfar_ethtool.c
index ff756265d58f..9a2c16d69e2c 100644
--- a/drivers/net/ethernet/freescale/gianfar_ethtool.c
+++ b/drivers/net/ethernet/freescale/gianfar_ethtool.c
@@ -1464,6 +1464,7 @@ static int gfar_get_ts_info(struct net_device *dev,
 	ptp_node = of_find_compatible_node(NULL, NULL, "fsl,etsec-ptp");
 	if (ptp_node) {
 		ptp_dev = of_find_device_by_node(ptp_node);
+		of_node_put(ptp_node);
 		if (ptp_dev)
 			ptp = platform_get_drvdata(ptp_dev);
 	}
-- 
2.17.1