linux-kernel - [PATCH net v1 2/2] net: usb: lan78xx: Fix memory leak on device unplug by freeing PHY device

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Message-Id: <20241116130558.1352230-2-o.rempel@pengutronix.de>
Date: Sat, 16 Nov 2024 14:05:58 +0100
From: Oleksij Rempel <o.rempel@...gutronix.de>
To: "David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Woojung Huh <woojung.huh@...rochip.com>,
	Andrew Lunn <andrew+netdev@...n.ch>
Cc: Oleksij Rempel <o.rempel@...gutronix.de>,
	Raghuram Chary J <raghuramchary.jallipalli@...rochip.com>,
	kernel@...gutronix.de,
	linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org,
	UNGLinuxDriver@...rochip.com,
	Phil Elwell <phil@...pberrypi.org>
Subject: [PATCH net v1 2/2] net: usb: lan78xx: Fix memory leak on device unplug by freeing PHY device

Add calls to `phy_device_free` after `fixed_phy_unregister` to fix a
memory leak that occurs when the device is unplugged. This ensures
proper cleanup of pseudo fixed-link PHYs.

Fixes: 89b36fb5e532 ("lan78xx: Lan7801 Support for Fixed PHY")
Cc: Raghuram Chary J <raghuramchary.jallipalli@...rochip.com>
Signed-off-by: Oleksij Rempel <o.rempel@...gutronix.de>
---
 drivers/net/usb/lan78xx.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/net/usb/lan78xx.c b/drivers/net/usb/lan78xx.c
index 094a47b8b97e..9f191b6ce821 100644
--- a/drivers/net/usb/lan78xx.c
+++ b/drivers/net/usb/lan78xx.c
@@ -2380,6 +2380,7 @@ static int lan78xx_phy_init(struct lan78xx_net *dev)
 		if (dev->chipid == ID_REV_CHIP_ID_7801_) {
 			if (phy_is_pseudo_fixed_link(phydev)) {
 				fixed_phy_unregister(phydev);
+				phy_device_free(phydev);
 			} else {
 				phy_unregister_fixup_for_uid(PHY_KSZ9031RNX,
 							     0xfffffff0);
@@ -4246,8 +4247,10 @@ static void lan78xx_disconnect(struct usb_interface *intf)
 
 	phy_disconnect(net->phydev);
 
-	if (phy_is_pseudo_fixed_link(phydev))
+	if (phy_is_pseudo_fixed_link(phydev)) {
 		fixed_phy_unregister(phydev);
+		phy_device_free(phydev);
+	}
 
 	usb_scuttle_anchored_urbs(&dev->deferred);
 
-- 
2.39.5