CVE-2026-45938power: supply: pm8916_lbc: Fix use-after-free in power_supply_changed()

Official description

In the Linux kernel, the following vulnerability has been resolved: power: supply: pm8916_lbc: 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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/dbe579e620ef0f53db490ec79a8566e4ea8918ac
• https://git.kernel.org/stable/c/08e674e9862a2db46fb234eb7c5442455ece0131
• https://git.kernel.org/stable/c/d7d31fc99d248d5f47588f50dce5c7599c991c6a
• https://git.kernel.org/stable/c/b7508129978ae1e2ed9b0410396abc05def9c4eb