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.

Fixes: e86d69dd786e ("power_supply: Add support for Richtek RT9455 battery charger")
Cc: stable@vger.kernel.org
Assisted-by: Codex:gpt-5.6
Signed-off-by: Fan Wu <fanwu01@zju.edu.cn>
Link: https://patch.msgid.link/20260723225310.12663-1-fanwu01@zju.edu.cn
Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>

0 files changed, 0 insertions, 0 deletions