Description
In the Linux kernel, the following vulnerability has been resolved: power: supply: rt9455: 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
e86d69dd786e94046b8f5be7df1b9a8226a40b2a to < d4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfcaffectede86d69dd786e94046b8f5be7df1b9a8226a40b2a to < 62d753b916bd500bb269b7078cdab73198ab4718affectede86d69dd786e94046b8f5be7df1b9a8226a40b2a to < a39f8f06216f73ef40e71e2fe4ad071964c1fd36affectede86d69dd786e94046b8f5be7df1b9a8226a40b2a to < af261f218a7606f93d2c786353d60bb4feb56ef0affectede86d69dd786e94046b8f5be7df1b9a8226a40b2a to < 2178dc65d45e2f7bcaa8af8d80d100419bdab251affectede86d69dd786e94046b8f5be7df1b9a8226a40b2a to < 64e15155095f39f4dec9b4659da1238ef8fc54d4affectede86d69dd786e94046b8f5be7df1b9a8226a40b2a to < 721449a15170fc5f028a7576d7f65b9f60d53482affectede86d69dd786e94046b8f5be7df1b9a8226a40b2a to < e2febe375e5ea5afed92f4cd9711bde8f24ee6d2affected
Linux Linux
Default version status: affected
4.2affected0 to < 4.2unaffected5.10.252 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/d4e2e3c3caa26b93aa9f36d0a6824b584e2a8dfc ↗
- https://git.kernel.org/stable/c/62d753b916bd500bb269b7078cdab73198ab4718 ↗
- https://git.kernel.org/stable/c/a39f8f06216f73ef40e71e2fe4ad071964c1fd36 ↗
- https://git.kernel.org/stable/c/af261f218a7606f93d2c786353d60bb4feb56ef0 ↗
- https://git.kernel.org/stable/c/2178dc65d45e2f7bcaa8af8d80d100419bdab251 ↗
- https://git.kernel.org/stable/c/64e15155095f39f4dec9b4659da1238ef8fc54d4 ↗
- https://git.kernel.org/stable/c/721449a15170fc5f028a7576d7f65b9f60d53482 ↗
- https://git.kernel.org/stable/c/e2febe375e5ea5afed92f4cd9711bde8f24ee6d2 ↗