CVE-2026-31572i2c: designware: amdisp: Fix resume-probe race condition issue

Official description

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

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/83bcea9da91965484df64a6492b89e65d41ab31c
• https://git.kernel.org/stable/c/e81f0341754c309e33babea2821eda8f98f0b44c
• https://git.kernel.org/stable/c/e2f1ada8e089dd5a331bcd8b88125ae2af8d188f