CVE-2026-31572

In the Linux kernel, the following vulnerability has been resolved:

i2c: designware: amdisp: Fix resume-probe race condition issue

Identified resume-probe race condition in kernel v7.0 with the commit

38fa29b01a6a ("i2c: designware: Combine the init functions"),but this

issue existed from the beginning though not detected.

The amdisp i2c device requires ISP to be in power-on state for probe

to succeed. To meet this requirement, this device is added to genpd

to control ISP power using runtime PM. The pm_runtime_get_sync() called

before i2c_dw_probe() triggers PM resume, which powers on ISP and also

invokes the amdisp i2c runtime resume before the probe completes resulting

in this race condition and a NULL dereferencing issue in v7.0

Fix this race condition by using the genpd APIs directly during probe:

- Call dev_pm_genpd_resume() to Power ON ISP before probe

- Call dev_pm_genpd_suspend() to Power OFF ISP after probe

- Set the device to suspended state with pm_runtime_set_suspended()

- Enable runtime PM only after the device is fully initialized