CVE-2026-72346platform/x86: bitland-mifs-wmi: Fix NULL pointer dereference during suspend/resume

Official description

In the Linux kernel, the following vulnerability has been resolved: platform/x86: bitland-mifs-wmi: Fix NULL pointer dereference during suspend/resume The driver registers two distinct WMI devices: a control device (BITLAND_WMI_CONTROL) and an event device (BITLAND_WMI_EVENT). During the probe phase, the event device handling path returns early before initializing the platform profile device (data->pp_dev), leaving it NULL. However, the PM sleep operations are registered globally for the WMI driver and are triggered for both devices. When entering suspend, the event device invokes bitland_mifs_wmi_suspend(), which passes the uninitialized data->pp_dev (NULL) into laptop_profile_get(). This leads to a NULL pointer dereference inside dev_get_drvdata(), causing a kernel Oops and halting the suspend sequence. Fix this by adding a validity check for data->pp_dev in both the suspend and resume callbacks, safely skipping profile operations for the event device.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/6f2cb20d8e286218d51754f06ee219d8ce754b18
• https://git.kernel.org/stable/c/d3666875c75eb1bc8090343fa0d6fc8fb7924356