[PATCH v2 0/4] platform/chrome: cros_ec_chardev: Fix a potential UAF

[Tzung-Bi Shih <tzungbi@kernel.org>]

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.

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

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 | 171 +++++++++++++++++-----
 1 file changed, 132 insertions(+), 39 deletions(-)

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2.51.0