diff --git a/drivers/acpi/acpica/rscalc.c b/drivers/acpi/acpica/rscalc.c
index b6667ff..88b5a2c 100644
--- a/drivers/acpi/acpica/rscalc.c
+++ b/drivers/acpi/acpica/rscalc.c
@@ -543,6 +543,13 @@
 
 		package_element = *top_object_list;
 
+		/* We must have a valid Package object */
+
+		if (!package_element ||
+		    (package_element->common.type != ACPI_TYPE_PACKAGE)) {
+			return_ACPI_STATUS (AE_AML_OPERAND_TYPE);
+		}
+
 		/*
 		 * The sub_object_list will now point to an array of the
 		 * four IRQ elements: Address, Pin, Source and source_index