Commit 47e6a863 authored by Huisong Li's avatar Huisong Li Committed by Rafael J. Wysocki
Browse files

ACPI: processor: idle: Fix NULL pointer dereference in hotplug path 



A cpuidle_device might fail to register during boot, but the system can
continue to run. In such cases, acpi_processor_hotplug() can trigger
a NULL pointer dereference when accessing the per-cpu acpi_cpuidle_device.

So add NULL pointer check for the per-cpu acpi_cpuidle_device in
acpi_processor_hotplug.

Signed-off-by: default avatarHuisong Li <lihuisong@huawei.com>
Link: https://patch.msgid.link/20260403090253.998322-1-lihuisong@huawei.com


Signed-off-by: default avatarRafael J. Wysocki <rafael.j.wysocki@intel.com>
parent 02c68ed1

drivers/acpi/processor_idle.c

+2 −3
Original line number Diff line number Diff line
@@ -1267,16 +1267,15 @@ static int acpi_processor_get_power_info(struct acpi_processor *pr) 


int acpi_processor_hotplug(struct acpi_processor *pr)

{

	struct cpuidle_device *dev = per_cpu(acpi_cpuidle_device, pr->id);

	int ret = 0;

	struct cpuidle_device *dev;



	if (disabled_by_idle_boot_param())

		return 0;



	if (!pr->flags.power_setup_done)

	if (!pr->flags.power_setup_done || !dev)

		return -ENODEV;



	dev = per_cpu(acpi_cpuidle_device, pr->id);

	cpuidle_pause_and_lock();

	cpuidle_disable_device(dev);

	ret = acpi_processor_get_power_info(pr);