CVE-2022-48961

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> net: mdio: fix unbalanced fwnode reference count in mdio_device_release()<br /> <br /> There is warning report about of_node refcount leak<br /> while probing mdio device:<br /> <br /> OF: ERROR: memory leak, expected refcount 1 instead of 2,<br /> of_node_get()/of_node_put() unbalanced - destroy cset entry:<br /> attach overlay node /spi/soc@0/mdio@710700c0/ethernet@4<br /> <br /> In of_mdiobus_register_device(), we increase fwnode refcount<br /> by fwnode_handle_get() before associating the of_node with<br /> mdio device, but it has never been decreased in normal path.<br /> Since that, in mdio_device_release(), it needs to call<br /> fwnode_handle_put() in addition instead of calling kfree()<br /> directly.<br /> <br /> After above, just calling mdio_device_free() in the error handle<br /> path of of_mdiobus_register_device() is enough to keep the<br /> refcount balanced.