Description
In the Linux kernel, the following vulnerability has been resolved: power: supply: act8945a: 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 products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
a09209acd6a808794bdd7866af3678d1fd1d90e7 to < f2a0777b1e5a3cee1712c4d3e9095c0df8fc8cb3affecteda09209acd6a808794bdd7866af3678d1fd1d90e7 to < 0768e8525a46df103647ca5059b32320d7fd17e4affecteda09209acd6a808794bdd7866af3678d1fd1d90e7 to < d023ef9f748b2090f7a9dbdd5c622b6ad99088eaaffecteda09209acd6a808794bdd7866af3678d1fd1d90e7 to < 697bb5dc0cb4791e244f3970b067bc1ef33be9d9affecteda09209acd6a808794bdd7866af3678d1fd1d90e7 to < 76a42ba547a9b2e2337894f67a4d9247445007d5affecteda09209acd6a808794bdd7866af3678d1fd1d90e7 to < f27eb76def5c07e4d7cc468b40741f19dafc83ceaffecteda09209acd6a808794bdd7866af3678d1fd1d90e7 to < 83c1bd466c514cb24ca6ef347c5aac76a13c4e1eaffecteda09209acd6a808794bdd7866af3678d1fd1d90e7 to < 3291c51d4684d048dd2eb91b5b65fcfdaf72141faffected
Linux Linux
Default version status: affected
4.9affected0 to < 4.9unaffected5.10.252 to ≤ 5.10.*unaffected5.15.202 to ≤ 5.15.*unaffected6.1.165 to ≤ 6.1.*unaffected6.6.128 to ≤ 6.6.*unaffected6.12.75 to ≤ 6.12.*unaffected6.18.14 to ≤ 6.18.*unaffected6.19.4 to ≤ 6.19.*unaffected7.0 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/f2a0777b1e5a3cee1712c4d3e9095c0df8fc8cb3 ↗
- https://git.kernel.org/stable/c/0768e8525a46df103647ca5059b32320d7fd17e4 ↗
- https://git.kernel.org/stable/c/d023ef9f748b2090f7a9dbdd5c622b6ad99088ea ↗
- https://git.kernel.org/stable/c/697bb5dc0cb4791e244f3970b067bc1ef33be9d9 ↗
- https://git.kernel.org/stable/c/76a42ba547a9b2e2337894f67a4d9247445007d5 ↗
- https://git.kernel.org/stable/c/f27eb76def5c07e4d7cc468b40741f19dafc83ce ↗
- https://git.kernel.org/stable/c/83c1bd466c514cb24ca6ef347c5aac76a13c4e1e ↗
- https://git.kernel.org/stable/c/3291c51d4684d048dd2eb91b5b65fcfdaf72141f ↗