linux-kernel - [PATCH AUTOSEL 4.19 066/128] led: triggers: Fix a memory leak bug

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Message-Id: <20190922185418.2158-66-sashal@kernel.org>
Date:   Sun, 22 Sep 2019 14:53:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Wenwen Wang <wenwen@...uga.edu>, Pavel Machek <pavel@....cz>,
        Jacek Anaszewski <jacek.anaszewski@...il.com>,
        Sasha Levin <sashal@...nel.org>, linux-leds@...r.kernel.org
Subject: [PATCH AUTOSEL 4.19 066/128] led: triggers: Fix a memory leak bug

From: Wenwen Wang <wenwen@...uga.edu>

[ Upstream commit 60e2dde1e91ae0addb21ac380cc36ebee7534e49 ]

In led_trigger_set(), 'event' is allocated in kasprintf(). However, it is
not deallocated in the following execution if the label 'err_activate' or
'err_add_groups' is entered, leading to memory leaks. To fix this issue,
free 'event' before returning the error.

Fixes: 52c47742f79d ("leds: triggers: send uevent when changing triggers")
Signed-off-by: Wenwen Wang <wenwen@...uga.edu>
Acked-by: Pavel Machek <pavel@....cz>
Signed-off-by: Jacek Anaszewski <jacek.anaszewski@...il.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/leds/led-triggers.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/leds/led-triggers.c b/drivers/leds/led-triggers.c
index 17d73db1456eb..e4cb3811e82a3 100644
--- a/drivers/leds/led-triggers.c
+++ b/drivers/leds/led-triggers.c
@@ -177,6 +177,7 @@ int led_trigger_set(struct led_classdev *led_cdev, struct led_trigger *trig)
 	list_del(&led_cdev->trig_list);
 	write_unlock_irqrestore(&led_cdev->trigger->leddev_list_lock, flags);
 	led_set_brightness(led_cdev, LED_OFF);
+	kfree(event);
 
 	return ret;
 }
-- 
2.20.1