linux-kernel - [PATCH AUTOSEL 4.9 021/107] soc/tegra: Don't leak device tree node reference

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Message-Id: <20190128161947.57405-21-sashal@kernel.org>
Date:   Mon, 28 Jan 2019 11:18:21 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Yangtao Li <tiny.windzz@...il.com>,
        Thierry Reding <treding@...dia.com>,
        Sasha Levin <sashal@...nel.org>, linux-tegra@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 021/107] soc/tegra: Don't leak device tree node reference

From: Yangtao Li <tiny.windzz@...il.com>

[ Upstream commit 9eb40fa2cd2d1f6829e7b49bb22692f754b9cfe0 ]

of_find_node_by_path() acquires a reference to the node returned by it
and that reference needs to be dropped by its caller. soc_is_tegra()
doesn't do that, so fix it.

Signed-off-by: Yangtao Li <tiny.windzz@...il.com>
Acked-by: Jon Hunter <jonathanh@...dia.com>
[treding: slightly rewrite to avoid inline comparison]
Signed-off-by: Thierry Reding <treding@...dia.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/soc/tegra/common.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/tegra/common.c b/drivers/soc/tegra/common.c
index cd8f41351add..7bfb154d6fa5 100644
--- a/drivers/soc/tegra/common.c
+++ b/drivers/soc/tegra/common.c
@@ -22,11 +22,15 @@ static const struct of_device_id tegra_machine_match[] = {
 
 bool soc_is_tegra(void)
 {
+	const struct of_device_id *match;
 	struct device_node *root;
 
 	root = of_find_node_by_path("/");
 	if (!root)
 		return false;
 
-	return of_match_node(tegra_machine_match, root) != NULL;
+	match = of_match_node(tegra_machine_match, root);
+	of_node_put(root);
+
+	return match != NULL;
 }
-- 
2.19.1