Re: [PATCH v2 0/3] iio: hid-sensors: fix shared callbacks in temperature and humidity

[Joshua Crofts <joshua.crofts1@gmail.com>]

On Wed,  7 Oct 2026 11:44:20 -0700
Christopher Hoover <ch@murgatroid.com> wrote:

> hid-sensor-temperature and hid-sensor-humidity share one static
> struct hid_sensor_hub_callbacks across instances and overwrite its pdev
> on every probe.  With two temperature sensors, reports for one go to
> the other's pdev; once that device is removed,
> temperature_capture_sample() dereferences NULL.  I hit this on 7.0
> with two uhid-created sensors.
> 
> Patches 2-3 make the callbacks per instance, as the other HID sensor
> drivers do.  Patch 1 makes sensor_hub_remove_callback() take
> pdata->lock, as sensor_hub_raw_event() does, so a report racing an
> unbind cannot call through the freed callbacks.
> 
> Changes in v2:
> - New patch 1, for the use-after-free on unbind found by the Sashiko
>   review of v1.
> 
> Christopher Hoover (3):
>   HID: hid-sensor-hub: Synchronize callback removal with raw events
>   iio: temperature: hid-sensor-temperature: Use per-instance callbacks
>   iio: humidity: hid-sensor-humidity: Use per-instance callbacks
> 
>  drivers/hid/hid-sensor-hub.c                     | 12 ++++++++++--
>  drivers/iio/humidity/hid-sensor-humidity.c       | 12 +++++-------
>  drivers/iio/temperature/hid-sensor-temperature.c | 12 +++++-------
>  3 files changed, 20 insertions(+), 16 deletions(-)
> 
> 
> base-commit: 9ee8306121495d2a25aa5d1bfd519f2748786b83

Also for future reference, please don't send a new version as a
reply to the previous version, it breaks tooling :(

-- 
Kind regards,
Joshua Crofts