linux-kernel - [PATCH 4.19 003/220] tee: optee: add missing of_node_put after of_device_is

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Message-Id: <20191122100912.931081612@linuxfoundation.org>
Date:   Fri, 22 Nov 2019 11:26:08 +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>,
        Jens Wiklander <jens.wiklander@...aro.org>,
        Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
Subject: [PATCH 4.19 003/220] tee: optee: add missing of_node_put after of_device_is_available

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

commit c7c0d8df0b94a67377555a550b8d66ee2ad2f4ed upstream.

Add an of_node_put when a tested device node is not available.

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

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: db878f76b9ff ("tee: optee: take DT status property into account")
Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>
Signed-off-by: Jens Wiklander <jens.wiklander@...aro.org>
Cc: Nobuhiro Iwamatsu <nobuhiro1.iwamatsu@...hiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/tee/optee/core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/tee/optee/core.c
+++ b/drivers/tee/optee/core.c
@@ -696,8 +696,10 @@ static int __init optee_driver_init(void
 		return -ENODEV;
 
 	np = of_find_matching_node(fw_np, optee_match);
-	if (!np || !of_device_is_available(np))
+	if (!np || !of_device_is_available(np)) {
+		of_node_put(np);
 		return -ENODEV;
+	}
 
 	optee = optee_probe(np);
 	of_node_put(np);