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 --- drivers/usb/phy/phy-isp1301.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/phy/phy-isp1301.c b/drivers/usb/phy/phy-isp1301.c index f9b5c411aee4..2940f0c84e1b 100644 --- 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);