linux-kernel - [PATCH AUTOSEL 4.9 12/13] of: unittest: kmemleak on changeset destroy

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Message-Id: <20200424122447.10882-12-sashal@kernel.org>
Date:   Fri, 24 Apr 2020 08:24:45 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Frank Rowand <frank.rowand@...y.com>,
        "Erhard F ." <erhard_f@...lbox.org>, Rob Herring <robh@...nel.org>,
        Sasha Levin <sashal@...nel.org>, devicetree@...r.kernel.org
Subject: [PATCH AUTOSEL 4.9 12/13] of: unittest: kmemleak on changeset destroy

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

[ Upstream commit b3fb36ed694b05738d45218ea72cf7feb10ce2b1 ]

kmemleak reports several memory leaks from devicetree unittest.
This is the fix for problem 1 of 5.

of_unittest_changeset() reaches deeply into the dynamic devicetree
functions.  Several nodes were left with an elevated reference
count and thus were not properly cleaned up.  Fix the reference
counts so that the memory will be freed.

Fixes: 201c910bd689 ("of: Transactional DT support.")
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 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c
index 92530525e3556..40d170c1ecd50 100644
--- a/drivers/of/unittest.c
+++ b/drivers/of/unittest.c
@@ -539,6 +539,10 @@ static void __init of_unittest_changeset(void)
 	unittest(!of_changeset_revert(&chgset), "revert failed\n");
 
 	of_changeset_destroy(&chgset);
+
+	of_node_put(n1);
+	of_node_put(n2);
+	of_node_put(n21);
 #endif
 }
 
-- 
2.20.1