linux-kernel - [PATCH 5.7 317/376] power: supply: core: fix memory leak in HWMON error path

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Date:   Fri, 19 Jun 2020 16:33:55 +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, stable@...nel.org,
        Qiushi Wu <wu000273@....edu>,
        Sebastian Reichel <sebastian.reichel@...labora.com>
Subject: [PATCH 5.7 317/376] power: supply: core: fix memory leak in HWMON error path

From: Qiushi Wu <wu000273@....edu>

commit 1d7a7128a2e9e1f137c99b0a44e94d70a77343e3 upstream.

In function power_supply_add_hwmon_sysfs(), psyhw->props is
allocated by bitmap_zalloc(). But this pointer is not deallocated
when devm_add_action fail,  which lead to a memory leak bug. To fix
this, we replace devm_add_action with devm_add_action_or_reset.

Cc: stable@...nel.org
Fixes: e67d4dfc9ff19 ("power: supply: Add HWMON compatibility layer")
Signed-off-by: Qiushi Wu <wu000273@....edu>
Signed-off-by: Sebastian Reichel <sebastian.reichel@...labora.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/power/supply/power_supply_hwmon.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/power/supply/power_supply_hwmon.c
+++ b/drivers/power/supply/power_supply_hwmon.c
@@ -304,7 +304,7 @@ int power_supply_add_hwmon_sysfs(struct
 		goto error;
 	}
 
-	ret = devm_add_action(dev, power_supply_hwmon_bitmap_free,
+	ret = devm_add_action_or_reset(dev, power_supply_hwmon_bitmap_free,
 			      psyhw->props);
 	if (ret)
 		goto error;