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Commit 3362a6ba authored by Lin Ming's avatar Lin Ming Committed by Len Brown
Browse files

ACPICA: Region deletion: Ensure region object is removed from handler list 

Prevents a possible fault when a dynamic operation region is
deleted. ACPICA BZ 507.

http://acpica.org/bugzilla/show_bug.cgi?id=507



Signed-off-by: default avatarLin Ming <ming.m.lin@intel.com>
Signed-off-by: default avatarBob Moore <robert.moore@intel.com>
Signed-off-by: default avatarLen Brown <len.brown@intel.com>
parent c446eed6

drivers/acpi/acpica/utdelete.c

+21 −0
Original line number Diff line number Diff line
@@ -75,6 +75,7 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object) 
	union acpi_operand_object *handler_desc;

	union acpi_operand_object *second_desc;

	union acpi_operand_object *next_desc;

	union acpi_operand_object **last_obj_ptr;



	ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object);
@@ -223,6 +224,26 @@ static void acpi_ut_delete_internal_obj(union acpi_operand_object *object) 
			 */

			handler_desc = object->region.handler;

			if (handler_desc) {

				next_desc =

				    handler_desc->address_space.region_list;

				last_obj_ptr =

				    &handler_desc->address_space.region_list;



				/* Remove the region object from the handler's list */



				while (next_desc) {

					if (next_desc == object) {

						*last_obj_ptr =

						    next_desc->region.next;

						break;

					}



					/* Walk the linked list of handler */



					last_obj_ptr = &next_desc->region.next;

					next_desc = next_desc->region.next;

				}



				if (handler_desc->address_space.handler_flags &

				    ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {