[PATCH v3 0/4] platform/chrome: cros_ec_chardev: Fix a potential UAF

[Tzung-Bi Shih]

  This series addresses a potential Use-After-Free error when a device is
deregistered while file operations are still in progress or files remain
open in cros_ec_chardev.

- Patches 1 to 3 are preparation steps in cros_ec_chardev driver.  They
  introduce reference counting for platform driver data and an event
  relayer.  This removes the direct access to `ec_dev->event_notifier`
  in `cros_ec_chardev_release()`.
- Patch 4 introduces a rwsem for protecting `ec_dev` to prevent the UAF
  error.

---
v3:
- Address review comment in patch 4.

v2: https://lore.kernel.org/all/20260516143017.18560-1-tzungbi@xxxxxxxxxx
- Merge patches 5 to 7 from
  https://lore.kernel.org/all/20260427134659.95181-1-tzungbi@xxxxxxxxxx.

v1: Doesn't exist.

Tzung-Bi Shih (4):
  platform/chrome: cros_ec_chardev: Introduce chardev_data
  platform/chrome: cros_ec_chardev: Move data to chardev_pdata
  platform/chrome: cros_ec_chardev: Add event relayer
  platform/chrome: cros_ec_chardev: Introduce rwsem for protecting
    ec_dev

 drivers/platform/chrome/cros_ec_chardev.c | 146 +++++++++++++++++-----
 1 file changed, 116 insertions(+), 30 deletions(-)

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2.54.0.794.g4f17f83d09-goog