diff --git a/drivers/acpi/acpica/utresrc.c b/drivers/acpi/acpica/utresrc.c
index e1cc3d348750..cff7901f7866 100644
--- a/drivers/acpi/acpica/utresrc.c
+++ b/drivers/acpi/acpica/utresrc.c
@@ -361,16 +361,20 @@ acpi_ut_validate_resource(struct acpi_walk_state *walk_state,
 	aml_resource = ACPI_CAST_PTR(union aml_resource, aml);
 	if (resource_type == ACPI_RESOURCE_NAME_SERIAL_BUS) {
 
+		/* Avoid undefined behavior: member access within misaligned address */
+
+		struct aml_resource_common_serialbus common_serial_bus;
+		memcpy(&common_serial_bus, aml_resource,
+		       sizeof(common_serial_bus));
+
 		/* Validate the bus_type field */
 
-		if ((aml_resource->common_serial_bus.type == 0) ||
-		    (aml_resource->common_serial_bus.type >
-		     AML_RESOURCE_MAX_SERIALBUSTYPE)) {
+		if ((common_serial_bus.type == 0) ||
+		    (common_serial_bus.type > AML_RESOURCE_MAX_SERIALBUSTYPE)) {
 			if (walk_state) {
 				ACPI_ERROR((AE_INFO,
 					    "Invalid/unsupported SerialBus resource descriptor: BusType 0x%2.2X",
-					    aml_resource->common_serial_bus.
-					    type));
+					    common_serial_bus.type));
 			}
 			return (AE_AML_INVALID_RESOURCE_TYPE);
 		}