linux-kernel - [PATCH AUTOSEL 5.8 06/20] clk: versatile: Add of_node

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Date:   Mon, 21 Sep 2020 10:40:13 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Sumera Priyadarsini <sylphrenadin@...il.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Stephen Boyd <sboyd@...nel.org>,
        Sasha Levin <sashal@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org
Subject: [PATCH AUTOSEL 5.8 06/20] clk: versatile: Add of_node_put() before return statement

From: Sumera Priyadarsini <sylphrenadin@...il.com>

[ Upstream commit da9c43dc0e2ec5c42a3d414e389feb30467000e2 ]

Every iteration of for_each_available_child_of_node() decrements
the reference count of the previous node, however when control is
transferred from the middle of the loop, as in the case of a return
or break or goto, there is no decrement thus ultimately resulting in
a memory leak.

Fix a potential memory leak in clk-impd1.c by inserting
of_node_put() before a return statement.

Issue found with Coccinelle.

Signed-off-by: Sumera Priyadarsini <sylphrenadin@...il.com>
Link: https://lore.kernel.org/r/20200829175704.GA10998@Kaladin
Reviewed-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Stephen Boyd <sboyd@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/clk/versatile/clk-impd1.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/clk/versatile/clk-impd1.c b/drivers/clk/versatile/clk-impd1.c
index ca798249544d0..85c395df9c008 100644
--- a/drivers/clk/versatile/clk-impd1.c
+++ b/drivers/clk/versatile/clk-impd1.c
@@ -109,8 +109,10 @@ static int integrator_impd1_clk_probe(struct platform_device *pdev)
 
 	for_each_available_child_of_node(np, child) {
 		ret = integrator_impd1_clk_spawn(dev, np, child);
-		if (ret)
+		if (ret) {
+			of_node_put(child);
 			break;
+		}
 	}
 
 	return ret;
-- 
2.25.1