linux-kernel - [PATCH] ata: libahci_platform: Add of_node

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Message-Id: <20190815060014.2191-1-nishkadg.linux@gmail.com>
Date:   Thu, 15 Aug 2019 11:30:14 +0530
From:   Nishka Dasgupta <nishkadg.linux@...il.com>
To:     hdegoede@...hat.com, axboe@...nel.dk, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Nishka Dasgupta <nishkadg.linux@...il.com>
Subject: [PATCH] ata: libahci_platform: Add of_node_put() before loop exit

Each iteration of for_each_child_of_node puts the previous node, but
in the case of a goto from the middle of the loop, there is no put,
thus causing a memory leak. Add an of_node_put before three such goto
statements.
Issue found with Coccinelle.

Signed-off-by: Nishka Dasgupta <nishkadg.linux@...il.com>
---
 drivers/ata/libahci_platform.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 9e9583a6bba9..e742780950de 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -497,6 +497,7 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 
 			if (of_property_read_u32(child, "reg", &port)) {
 				rc = -EINVAL;
+				of_node_put(child);
 				goto err_out;
 			}
 
@@ -514,14 +515,18 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 			if (port_dev) {
 				rc = ahci_platform_get_regulator(hpriv, port,
 								&port_dev->dev);
-				if (rc == -EPROBE_DEFER)
+				if (rc == -EPROBE_DEFER) {
+					of_node_put(child);
 					goto err_out;
+				}
 			}
 #endif
 
 			rc = ahci_platform_get_phy(hpriv, port, dev, child);
-			if (rc)
+			if (rc) {
+				of_node_put(child);
 				goto err_out;
+			}
 
 			enabled_ports++;
 		}
-- 
2.19.1