linux-kernel - [PATCH 4.9 102/125] of: unittest: kmemleak in of_unittest_platform

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Date:   Wed, 22 Apr 2020 11:56:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, "Erhard F." <erhard_f@...lbox.org>,
        Frank Rowand <frank.rowand@...y.com>,
        Rob Herring <robh@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.9 102/125] of: unittest: kmemleak in of_unittest_platform_populate()

From: Frank Rowand <frank.rowand@...y.com>

[ Upstream commit 216830d2413cc61be3f76bc02ffd905e47d2439e ]

kmemleak reports several memory leaks from devicetree unittest.
This is the fix for problem 2 of 5.

of_unittest_platform_populate() left an elevated reference count for
grandchild nodes (which are platform devices).  Fix the platform
device reference counts so that the memory will be freed.

Fixes: fb2caa50fbac ("of/selftest: add testcase for nodes with same name and address")
Reported-by: Erhard F. <erhard_f@...lbox.org>
Signed-off-by: Frank Rowand <frank.rowand@...y.com>
Signed-off-by: Rob Herring <robh@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/of/unittest.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 40d170c1ecd50..144d123f6ea4f 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -825,10 +825,13 @@ static void __init of_unittest_platform_populate(void)
 
 	of_platform_populate(np, match, NULL, &test_bus->dev);
 	for_each_child_of_node(np, child) {
-		for_each_child_of_node(child, grandchild)
-			unittest(of_find_device_by_node(grandchild),
+		for_each_child_of_node(child, grandchild) {
+			pdev = of_find_device_by_node(grandchild);
+			unittest(pdev,
 				 "Could not create device for node '%s'\n",
 				 grandchild->name);
+			of_dev_put(pdev);
+		}
 	}
 
 	of_platform_depopulate(&test_bus->dev);
-- 
2.20.1