CVE-2021-47416

In the Linux kernel, the following vulnerability has been resolved: phy: mdio: fix memory leak Syzbot reported memory leak in MDIO bus interface, the problem was in wrong state logic. MDIOBUS_ALLOCATED indicates 2 states: 1. Bus is only allocated 2. Bus allocated and __mdiobus_register() fails, but device_register() was called In case of device_register() has been called we should call put_device() to correctly free the memory allocated for this device, but mdiobus_free() calls just kfree(dev) in case of MDIOBUS_ALLOCATED state To avoid this behaviour we need to set bus->state to MDIOBUS_UNREGISTERED _before_ calling device_register(), because put_device() should be called even in case of device_register() failure.

• linux linux kernel (>= 2.6.28 < 4.4.289) • linux linux kernel (>= 4.5 < 4.9.287) • linux linux kernel (>= 4.10 < 4.14.251) • linux linux kernel (>= 4.15 < 4.19.211) • linux linux kernel (>= 4.20 < 5.4.153) • linux linux kernel (>= 5.5 < 5.10.73) • linux linux kernel (>= 5.11 < 5.14.12) • linux linux kernel 5.15