CVE-2022-50250

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

regulator: core: fix use_count leakage when handling boot-on

I found a use_count leakage towards supply regulator of rdev with boot-on option.

┌───────────────────┐ ┌───────────────────┐ │ regulatordev A │ │ regulatordev B │ │ (boot-on) │ │ (boot-on) │ │ usecount=0 │◀──supply──│ usecount=1 │ │ │ │ │ └───────────────────┘ └───────────────────┘

In case of rdev(A) configured with `regulator-boot-on', the usecount of supplying regulator(B) will increment inside regulatorenable(rdev->supply).

Thus, B will acts like always-on, and further balanced regulator_enable/disable cannot actually disable it anymore.

However, B was also configured with `regulator-boot-on', we wish it could be disabled afterwards.