6.6-stable review patch. If anyone has any objections, please let me know.
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From: Johan Hovold johan@kernel.org
commit b4b64fda4d30a83a7f00e92a0c8a1d47699609f3 upstream.
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 --- drivers/usb/phy/phy-isp1301.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
--- a/drivers/usb/phy/phy-isp1301.c +++ b/drivers/usb/phy/phy-isp1301.c @@ -149,7 +149,12 @@ struct i2c_client *isp1301_get_client(st 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);