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power: supply: lp8788-charger: fix use-after-free on remove
In the Linux kernel, the following vulnerability has been resolved: power: supply: lp8788-charger: fix use-after-free on remove lp8788_charger_remove() flushes charger_work before unregistering the IRQs. An IRQ thread can queue charger_work after flush_work() has returned. The work can then run after devres frees pchg and dereference it in lp8788_charger_event(). Unregister the IRQs first. free_irq() waits for any running threaded handler, so no handler can queue more work afterwards. Then use cancel_work_sync() to cancel pending work or wait for running work to finish. This issue was found by an in-house static analysis tool.
References
Affected products
Linux
- <3.7
- ==3.7
- <88d8eadfad5d9ff967e74090152940bcfa27df69
- <831c29a12d560f8a3225f43050b3fbb5dfd79c66
- <b3aa1e9509e1b0a863353356d617fb45d1b6250a
- =<7.2.*
- =<6.18.*
- =<6.12.*
- <b4eb6a056b441ba0caedfbfc42cec501acf12f67
- =<*