linux-kernel - [PATCH] phy: tegra: xusb: Fix use-after-free issue

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Date:   Thu, 4 May 2023 13:54:46 +0800
From:   Haotien Hsu <haotienh@...dia.com>
To:     JC Kuo <jckuo@...dia.com>, Vinod Koul <vkoul@...nel.org>,
        "Kishon Vijay Abraham I" <kishon@...nel.org>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan Hunter <jonathanh@...dia.com>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        <linux-phy@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
CC:     Wayne Chang <waynec@...dia.com>, EJ Hsu <ejh@...dia.com>,
        Haotien Hsu <haotienh@...dia.com>
Subject: [PATCH] phy: tegra: xusb: Fix use-after-free issue

From: EJ Hsu <ejh@...dia.com>

For the dual-role port, it will assign the phy dev to usb-phy dev and
use the port dev driver as the dev driver of usb-phy.

When we try to destroy the port dev, it will destroy its dev driver
as well. But we did not remove the reference from usb-phy dev. This
might cause the use-after-free issue in KASAN.

Fixes: e8f7d2f409a1 ("phy: tegra: xusb: Add usb-phy support")
Cc: stable@...r.kernel.org

Signed-off-by: EJ Hsu <ejh@...dia.com>
Signed-off-by: Haotien Hsu <haotienh@...dia.com>
---
 drivers/phy/tegra/xusb.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/phy/tegra/xusb.c b/drivers/phy/tegra/xusb.c
index 78045bd6c214..515298a9a433 100644
--- a/drivers/phy/tegra/xusb.c
+++ b/drivers/phy/tegra/xusb.c
@@ -563,13 +563,6 @@ static int tegra_xusb_port_init(struct tegra_xusb_port *port,
 
 static void tegra_xusb_port_unregister(struct tegra_xusb_port *port)
 {
-	if (!IS_ERR_OR_NULL(port->usb_role_sw)) {
-		of_platform_depopulate(&port->dev);
-		usb_role_switch_unregister(port->usb_role_sw);
-		cancel_work_sync(&port->usb_phy_work);
-		usb_remove_phy(&port->usb_phy);
-	}
-
 	if (port->ops->remove)
 		port->ops->remove(port);
 
@@ -832,6 +825,14 @@ void tegra_xusb_usb2_port_remove(struct tegra_xusb_port *port)
 {
 	struct tegra_xusb_usb2_port *usb2 = to_usb2_port(port);
 
+	if (!IS_ERR_OR_NULL(port->usb_role_sw)) {
+		of_platform_depopulate(&port->dev);
+		usb_role_switch_unregister(port->usb_role_sw);
+		cancel_work_sync(&port->usb_phy_work);
+		usb_remove_phy(&port->usb_phy);
+		port->usb_phy.dev->driver = NULL;
+	}
+
 	regulator_put(usb2->supply);
 }
 
-- 
2.25.1