--- linux-2.5.8-pre3/drivers/acpi/executer/exfield.c.orig	Thu Apr 11 00:40:19 2002
+++ linux-2.5.8-pre3/drivers/acpi/executer/exfield.c	Thu Apr 11 00:36:52 2002
@@ -103,6 +103,10 @@
 	/* Handle both ACPI 1.0 and ACPI 2.0 Integer widths */
 
 	integer_size = sizeof (acpi_integer);
+	if (!walk_state || !walk_state->method_node) {
+		printk("ACPI argh!\n");
+		return_ACPI_STATUS(AE_ERROR);
+	}
 	if (walk_state->method_node->flags & ANOBJ_DATA_WIDTH_32) {
 		/*
 		 * We are running a method that exists in a 32-bit ACPI table.