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

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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: Huisong Li <lihuisong@huawei.com>
Link: https://patch.msgid.link/20260403090253.998322-1-lihuisong@huawei.com
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Huisong Li 2026-04-03 17:02:53 +08:00 committed by Rafael J. Wysocki
parent 02c68ed11c
commit 47e6a863a8
1 changed files with 2 additions and 3 deletions
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5
drivers/acpi/processor_idle.c
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@ -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);