linux-kernel - [PATCH 5.12 294/363] hwmon: (ltc2992) Put fwnode in error case during ->probe()

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Message-Id: <20210517140312.535276129@linuxfoundation.org>
Date:   Mon, 17 May 2021 16:02:40 +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,
        Alexandru Tachici <alexandru.tachici@...log.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>,
        Guenter Roeck <linux@...ck-us.net>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 294/363] hwmon: (ltc2992) Put fwnode in error case during ->probe()

From: Andy Shevchenko <andy.shevchenko@...il.com>

[ Upstream commit 8370e5b093080c03cf89f7ebf0bef6984545429e ]

In each iteration fwnode_for_each_available_child_node() bumps a reference
counting of a loop variable followed by dropping in on a next iteration,

Since in error case the loop is broken, we have to drop a reference count
by ourselves. Do it for port_fwnode in error case during ->probe().

Fixes: b0bd407e94b0 ("hwmon: (ltc2992) Add support")
Cc: Alexandru Tachici <alexandru.tachici@...log.com>
Signed-off-by: Andy Shevchenko <andy.shevchenko@...il.com>
Link: https://lore.kernel.org/r/20210510100136.3303142-1-andy.shevchenko@gmail.com
Signed-off-by: Guenter Roeck <linux@...ck-us.net>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/hwmon/ltc2992.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/hwmon/ltc2992.c b/drivers/hwmon/ltc2992.c
index 4382105bf142..2a4bed0ab226 100644
--- a/drivers/hwmon/ltc2992.c
+++ b/drivers/hwmon/ltc2992.c
@@ -900,11 +900,15 @@ static int ltc2992_parse_dt(struct ltc2992_state *st)
 
 	fwnode_for_each_available_child_node(fwnode, child) {
 		ret = fwnode_property_read_u32(child, "reg", &addr);
-		if (ret < 0)
+		if (ret < 0) {
+			fwnode_handle_put(child);
 			return ret;
+		}
 
-		if (addr > 1)
+		if (addr > 1) {
+			fwnode_handle_put(child);
 			return -EINVAL;
+		}
 
 		ret = fwnode_property_read_u32(child, "shunt-resistor-micro-ohms", &val);
 		if (!ret)
-- 
2.30.2