linux-kernel - [PATCH 2/5] net: mscc: ocelot: fix a leaked reference by adding a missing of_node

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Date:   Fri, 22 Feb 2019 15:15:39 +0800
From:   Wen Yang <wen.yang99@....com.cn>
To:     linus.walleij@...aro.org
Cc:     andrew@...n.ch, vivien.didelot@...il.com, f.fainelli@...il.com,
        davem@...emloft.net, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, alexandre.belloni@...tlin.com,
        UNGLinuxDriver@...rochip.com, nbd@....name,
        lorenzo.bianconi83@...il.com, kvalo@...eaurora.org,
        matthias.bgg@...il.com, linux-wireless@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, anirudh@...inx.com,
        John.Linn@...inx.com, michal.simek@...inx.com,
        wang.yi59@....com.cn, Wen Yang <wen.yang99@....com.cn>
Subject: [PATCH 2/5] net: mscc: ocelot: fix a leaked reference by adding a missing of_node_put

The call to of_parse_phandle returns a node pointer with refcount
incremented thus it must be explicitly decremented after the last
usage.

Detected by coccinelle with the following warnings:
./drivers/net/ethernet/mscc/ocelot_board.c:293:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 249, but without a corresponding object release within this function.
./drivers/net/ethernet/mscc/ocelot_board.c:312:3-9: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 249, but without a corresponding object release within this function.
./drivers/net/ethernet/mscc/ocelot_board.c:336:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 249, but without a corresponding object release within this function.
./drivers/net/ethernet/mscc/ocelot_board.c:339:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 249, but without a corresponding object release within this function.

Signed-off-by: Wen Yang <wen.yang99@....com.cn>
Cc: Alexandre Belloni <alexandre.belloni@...tlin.com>
Cc: Microchip Linux Driver Support <UNGLinuxDriver@...rochip.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
 drivers/net/ethernet/mscc/ocelot_board.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mscc/ocelot_board.c b/drivers/net/ethernet/mscc/ocelot_board.c
index ca3ea2f..f1485a6 100644
--- a/drivers/net/ethernet/mscc/ocelot_board.c
+++ b/drivers/net/ethernet/mscc/ocelot_board.c
@@ -290,7 +290,7 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 
 		err = ocelot_probe_port(ocelot, port, regs, phy);
 		if (err)
-			return err;
+			goto err_probe_ports;
 
 		err = of_get_phy_mode(portnp);
 		if (err < 0)
@@ -309,7 +309,8 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 			dev_err(ocelot->dev,
 				"invalid phy mode for port%d, (Q)SGMII only\n",
 				port);
-			return -EINVAL;
+			err = -EINVAL;
+			goto err_probe_ports;
 		}
 
 		serdes = devm_of_phy_get(ocelot->dev, portnp, NULL);
@@ -328,6 +329,7 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 		ocelot->ports[port]->serdes = serdes;
 	}
 
+	of_node_put(ports);
 	register_netdevice_notifier(&ocelot_netdevice_nb);
 	register_switchdev_blocking_notifier(&ocelot_switchdev_blocking_nb);
 
@@ -336,6 +338,7 @@ static int mscc_ocelot_probe(struct platform_device *pdev)
 	return 0;
 
 err_probe_ports:
+	of_node_put(ports);
 	return err;
 }
 
-- 
2.9.5