power: supply: rt9455: quiesce delayed work before teardown

Overview

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

power: supply: rt9455: quiesce delayed work before teardown

The threaded IRQ handler can queue pwr_rdy_work, max_charging_time_work and batt_presence_work. pwr_rdy_work and batt_presence_work can also queue max_charging_time_work, while batt_presence_work can requeue itself.

rt9455_remove() cancels max_charging_time_work before batt_presence_work. The latter can therefore queue max_charging_time_work after it has already been cancelled:

rt9455_remove() workqueue cancel pwr_rdy_work cancel max_charging_time_work batt_presence_work queues max_charging_time_work cancel batt_presence_work return devres frees rt9455_info max_charging_time_work dereferences rt9455_info

The IRQ also remains registered until devres cleanup and can queue more work after any of the cancellation calls. If rt9455_hw_init() fails after the IRQ has been requested, probe returns without cancelling work that may already have been queued. A pending callback can then access rt9455_info after it has been freed.

Register rt9455_cancel_all_delayed_works() through devm_add_action_or_reset() right after devm_power_supply_register(). devres invokes the action in reverse registration order, after the managed IRQ has been freed and before rt9455_info is released, so the delayed works are drained in both rt9455_remove() and the probe error path. Cancel pwr_rdy_work and batt_presence_work before max_charging_time_work because both can queue the latter.

This issue was found by an in-house static analysis tool.

Affected

• Linux >= e86d69dd786e94046b8f5be7df1b9a8226a40b2a < 442c60c08ec23ac45da0a58877cab05e0a58f4ea
• Linux >= e86d69dd786e94046b8f5be7df1b9a8226a40b2a < df67c7a2fff8414aa766b8cd5ffe11ec1ca27d02
• Linux >= e86d69dd786e94046b8f5be7df1b9a8226a40b2a < 1b9978433c61a9b46e48832a1ebceee1cf5c9eb4
• Linux >= e86d69dd786e94046b8f5be7df1b9a8226a40b2a < 7323e562f6961e4b7bce3225cde4ecbc78260deb
• Linux >= e86d69dd786e94046b8f5be7df1b9a8226a40b2a < 3e7a1ebc32fad5a558254a478efd401c17a24381
• Linux 4.2

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Vendor advisories

• Red Hat VEX · Moderate · updated 2026-09-17 · vex