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ACPI: processor: idle: Check acpi_fetch_acpi_dev() return value

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[ Upstream commit 2437513a814b3e93bd02879740a8a06e52e2cf7d ]

The return value of acpi_fetch_acpi_dev() could be NULL, which would
cause a NULL pointer dereference to occur in acpi_device_hid().

Signed-off-by: Li Zhong <floridsleeves@gmail.com>
[ rjw: Subject and changelog edits, added empty line after if () ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Li Zhong 2022-09-02 00:37:30 -07:00 committed by Greg Kroah-Hartman
parent 3d340b684d
commit b85f0e292f
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/processor_idle.c
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@ -1134,6 +1134,9 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
status = acpi_get_parent(handle, &pr_ahandle);
while (ACPI_SUCCESS(status)) {
d = acpi_fetch_acpi_dev(pr_ahandle);
if (!d)
break;
handle = pr_ahandle;
if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))