From: Li Zhong floridsleeves@gmail.com
[ 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 --- drivers/acpi/processor_idle.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c index acfabfe07c4f..fc5b5b2c9e81 100644 --- a/drivers/acpi/processor_idle.c +++ b/drivers/acpi/processor_idle.c @@ -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))