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ACPI: processor: idle: Check acpi_fetch_acpi_dev() return value
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>
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@ -1134,6 +1134,9 @@ static int acpi_processor_get_lpi_info(struct acpi_processor *pr)
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status = acpi_get_parent(handle, &pr_ahandle);
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status = acpi_get_parent(handle, &pr_ahandle);
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while (ACPI_SUCCESS(status)) {
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while (ACPI_SUCCESS(status)) {
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d = acpi_fetch_acpi_dev(pr_ahandle);
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d = acpi_fetch_acpi_dev(pr_ahandle);
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if (!d)
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break;
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handle = pr_ahandle;
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handle = pr_ahandle;
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if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
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if (strcmp(acpi_device_hid(d), ACPI_PROCESSOR_CONTAINER_HID))
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