In the Linux kernel, the following vulnerability has been resolved:
power: supply: bq256xx: Fix use-after-free in power_supply_changed()
Using the devm_ variant for requesting IRQ _before_ the devm_
variant for allocating/registering the power_supply handle, means that
the power_supply handle will be deallocated/unregistered _before_ the
interrupt handler (since devm_ naturally deallocates in reverse
allocation order). This means that during removal, there is a race
condition where an interrupt can fire just _after_ the power_supply
handle has been freed, *but* just _before_ the corresponding
unregistration of the IRQ handler has run.
This will lead to the IRQ handler calling power_supply_changed() with
a freed power_supply handle. Which usually crashes the system or
otherwise silently corrupts the memory...
Note that there is a similar situation which can also happen during
probe(); the possibility of an interrupt firing _before_ registering
the power_supply handle. This would then lead to the nasty situation
of using the power_supply handle *uninitialized* in
power_supply_changed().
Fix this racy use-after-free by making sure the IRQ is requested _after_
the registration of the power_supply handle.