netdev - [PATCH net-next v2 1/1] net: phy: Fix reading LED reg property

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Message-Id: <20230424141648.317944-1-alexander.stein@ew.tq-group.com>
Date:   Mon, 24 Apr 2023 16:16:48 +0200
From:   Alexander Stein <alexander.stein@...tq-group.com>
To:     Andrew Lunn <andrew@...n.ch>,
        Heiner Kallweit <hkallweit1@...il.com>,
        Russell King <linux@...linux.org.uk>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Christian Marangi <ansuelsmth@...il.com>
Cc:     Alexander Stein <alexander.stein@...tq-group.com>,
        netdev@...r.kernel.org
Subject: [PATCH net-next v2 1/1] net: phy: Fix reading LED reg property

'reg' is always encoded in 32 bits, thus it has to be read using the
function with the corresponding bit width.

Fixes: 01e5b728e9e4 ("net: phy: Add a binding for PHY LEDs")
Signed-off-by: Alexander Stein <alexander.stein@...tq-group.com>
---
Changes in v2:
* Explicitly do range check before assigning to u8

 drivers/net/phy/phy_device.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index d373446ab5ac..17d0d0555a79 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -3028,6 +3028,7 @@ static int of_phy_led(struct phy_device *phydev,
 	struct led_init_data init_data = {};
 	struct led_classdev *cdev;
 	struct phy_led *phyled;
+	u32 index;
 	int err;
 
 	phyled = devm_kzalloc(dev, sizeof(*phyled), GFP_KERNEL);
@@ -3037,10 +3038,13 @@ static int of_phy_led(struct phy_device *phydev,
 	cdev = &phyled->led_cdev;
 	phyled->phydev = phydev;
 
-	err = of_property_read_u8(led, "reg", &phyled->index);
+	err = of_property_read_u32(led, "reg", &index);
 	if (err)
 		return err;
+	if (index > U8_MAX)
+		return -EINVAL;
 
+	phyled->index = index;
 	if (phydev->drv->led_brightness_set)
 		cdev->brightness_set_blocking = phy_led_set_brightness;
 	if (phydev->drv->led_blink_set)
-- 
2.34.1