usb: phy: isp1301: fix non-OF device reference imbalance

A recent change fixing a device reference leak in a UDC driver
introduced a potential use-after-free in the non-OF case as the
isp1301_get_client() helper only increases the reference count for the
returned I2C device in the OF case.

Increment the reference count also for non-OF so that the caller can
decrement it unconditionally.

Note that this is inherently racy just as using the returned I2C device
is since nothing is preventing the PHY driver from being unbound while
in use.

Fixes: c84117912bdd ("USB: lpc32xx_udc: Fix error handling in probe")
Cc: stable@vger.kernel.org
Cc: Ma Ke <make24@iscas.ac.cn>
Signed-off-by: Johan Hovold <johan@kernel.org>
Reviewed-by: Vladimir Zapolskiy <vz@mleia.com>
Link: https://patch.msgid.link/20251218153519.19453-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/phy/phy-isp1301.c b/drivers/usb/phy/phy-isp1301.c
index f9b5c411aee4e542df9ca1d3403120c9168e765b..2940f0c84e1b7716651316b2afadb05cdbd23f21 100644 (file)
--- a/drivers/usb/phy/phy-isp1301.c
+++ b/drivers/usb/phy/phy-isp1301.c
@@ -149,7 +149,12 @@ struct i2c_client *isp1301_get_client(struct device_node *node)
                return client;
 
        /* non-DT: only one ISP1301 chip supported */
-       return isp1301_i2c_client;
+       if (isp1301_i2c_client) {
+               get_device(&isp1301_i2c_client->dev);
+               return isp1301_i2c_client;
+       }
+
+       return NULL;
 }
 EXPORT_SYMBOL_GPL(isp1301_get_client);