linux-kernel - [PATCH 4.20 054/111] OF: properties: add missing of_node

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Date:   Mon, 21 Jan 2019 14:42:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Julia Lawall <Julia.Lawall@...6.fr>,
        Rob Herring <robh@...nel.org>
Subject: [PATCH 4.20 054/111] OF: properties: add missing of_node_put

4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Julia Lawall <Julia.Lawall@...6.fr>

commit 28b170e88bc0c7509e6724717c15cb4b5686026e upstream.

Add an of_node_put when the result of of_graph_get_remote_port_parent is
not available.

The semantic match that finds this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@r exists@
local idexpression e;
expression x;
@@
e = of_graph_get_remote_port_parent(...);
... when != x = e
    when != true e == NULL
    when != of_node_put(e)
    when != of_fwnode_handle(e)
(
return e;
|
*return ...;
)
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
Cc: stable@...r.kernel.org
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/of/property.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/of/property.c
+++ b/drivers/of/property.c
@@ -806,6 +806,7 @@ struct device_node *of_graph_get_remote_
 
 	if (!of_device_is_available(remote)) {
 		pr_debug("not available for remote node\n");
+		of_node_put(remote);
 		return NULL;
 	}