[PATCH] platform/x86: thinkpad_acpi: Fix NULL pointer dereferences while probing

[Kurt Borja]

On Sun Mar 30, 2025 at 12:39 PM -03, Kurt Borja wrote:
> Some subdrivers make use of the global reference tpacpi_pdev during
> initialization, which is called from the platform driver's probe.
> However, after
>
> commit 38b9ab80db31 ("platform/x86: thinkpad_acpi: Move subdriver initialization to tpacpi_pdriver's probe.")
>
> this variable is only properly initialized *after* probing and this can
> result in a NULL pointer dereference.
>
> In order to fix this without reverting the commit, register the platform
> bundle in two steps, first create and initialize tpacpi_pdev, then
> register the driver synchronously with platform_driver_probe(). This way
> the benefits of commit 38b9ab80db31 are preserved.
>
> Additionally,
>
> commit 43fc63a1e8f6 ("platform/x86: thinkpad_acpi: Move HWMON initialization to tpacpi_hwmon_pdriver's probe")
>
> introduced a similar problem, however tpacpi_sensors_pdev is only used
> once inside the probe, so replace the global reference with the one
> given by the probe.

I don't understand why b4 added the linux-riscv list to the recipients,
but it was definitely not inteded.

Sorry for the noise.

-- 
 ~ Kurt