linux-kernel - [PATCH] regulator: of: Fix refcount leak bug in of_get_regulation

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Message-Id: <20220715111027.391032-1-windhl@126.com>
Date:   Fri, 15 Jul 2022 19:10:27 +0800
From:   Liang He <windhl@....com>
To:     lgirdwood@...il.com, broonie@...nel.org,
        linux-kernel@...r.kernel.org, windhl@....com
Subject: [PATCH] regulator: of: Fix refcount leak bug in of_get_regulation_constraints()

We should call the of_node_put() for the reference returned by
of_get_child_by_name() which has increased the refcount.

Fixes: 40e20d68bb3f ("regulator: of: Add support for parsing regulator_state for suspend state")
Signed-off-by: Liang He <windhl@....com>
---
I think no matter what the 'suspend_state' value is, it should call
of_node_put() when 'suspend_np' is not NULL as it will be replaced
in 'continue' to next loop.

 drivers/regulator/of_regulator.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/regulator/of_regulator.c b/drivers/regulator/of_regulator.c
index f54d4f176882..e12b681c72e5 100644
--- a/drivers/regulator/of_regulator.c
+++ b/drivers/regulator/of_regulator.c
@@ -264,8 +264,12 @@ static int of_get_regulation_constraints(struct device *dev,
 		}
 
 		suspend_np = of_get_child_by_name(np, regulator_states[i]);
-		if (!suspend_np || !suspend_state)
+		if (!suspend_np)
 			continue;
+		if (!suspend_state) {
+			of_node_put(suspend_np);
+			continue;
+		}
 
 		if (!of_property_read_u32(suspend_np, "regulator-mode",
 					  &pval)) {
-- 
2.25.1