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

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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: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Lin Ming 2009-05-21 11:03:29 +08:00 committed by Len Brown
parent c446eed618
commit 3362a6badb
1 changed files with 21 additions and 0 deletions
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21
drivers/acpi/acpica/utdelete.c
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@ -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 *handler_desc;
union acpi_operand_object *second_desc; union acpi_operand_object *second_desc;
union acpi_operand_object *next_desc; union acpi_operand_object *next_desc;
union acpi_operand_object **last_obj_ptr;
ACPI_FUNCTION_TRACE_PTR(ut_delete_internal_obj, object); 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; handler_desc = object->region.handler;
if (handler_desc) { 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 & if (handler_desc->address_space.handler_flags &
ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) { ACPI_ADDR_HANDLER_DEFAULT_INSTALLED) {