netdev - [PATCH v2 net-next resend] leds: trigger: netdev: uninitialized variable in netdev_trig

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Date: Wed, 14 Jun 2023 10:03:59 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Christian Marangi <ansuelsmth@...il.com>
Cc: Florian Fainelli <f.fainelli@...il.com>,
	Vladimir Oltean <olteanv@...il.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	Pavel Machek <pavel@....cz>, netdev@...r.kernel.org,
	Lee Jones <lee@...nel.org>, Andrew Lunn <andrew@...n.ch>,
	"David S. Miller" <davem@...emloft.net>, linux-leds@...r.kernel.org,
	kernel-janitors@...r.kernel.org
Subject: [PATCH v2 net-next resend] leds: trigger: netdev: uninitialized
 variable in netdev_trig_activate()

The qca8k_cled_hw_control_get() function which implements ->hw_control_get
sets the appropriate bits but does not clear them.  This leads to an
uninitialized variable bug.  Fix this by setting mode to zero at the
start.

Fixes: e0256648c831 ("net: dsa: qca8k: implement hw_control ops")
Signed-off-by: Dan Carpenter <dan.carpenter@...aro.org>
Reviewed-by: Andrew Lunn <andrew@...n.ch>
---
Resending because this actually goes through net-next and not the led
subsystem.

v2: In the original patch I fixed qca8k_cled_hw_control_get() instead
so that patch went to netdev instead of to the led subsystem.
https://lore.kernel.org/all/5dff3719-f827-45b6-a0d3-a00efed1099b@moroto.mountain/
Fixing it here is a more reliable way to do it.

 drivers/leds/trigger/ledtrig-netdev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/leds/trigger/ledtrig-netdev.c b/drivers/leds/trigger/ledtrig-netdev.c
index b0a6f2749552..2311dae7f070 100644
--- a/drivers/leds/trigger/ledtrig-netdev.c
+++ b/drivers/leds/trigger/ledtrig-netdev.c
@@ -445,7 +445,7 @@ static void netdev_trig_work(struct work_struct *work)
 static int netdev_trig_activate(struct led_classdev *led_cdev)
 {
 	struct led_netdev_data *trigger_data;
-	unsigned long mode;
+	unsigned long mode = 0;
 	struct device *dev;
 	int rc;
 
-- 
2.39.2