In the Linux kernel, the following vulnerability has been resolved:

spi: tegra20-slink: fix UAF in tegra_slink_remove()

After calling spi_unregister_master(), the refcount of master will
be decrease to 0, and it will be freed in spi_controller_release(),
the device data also will be freed, so it will lead a UAF when using
'tspi'. To fix this, get the master before unregister and put it when
finish using it.