ACPICA: Predefined name repair: fix NULL package elements
For the predefined methods that return fixed-length packages
(or subpackages), attempt repair for a NULL element. Create an
Integer of value 0, a NULL String, or a zero-length buffer as
appropriate.
http://www.acpica.org/bugzilla/show_bug.cgi?id=818
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/acpica/nspredef.c b/drivers/acpi/acpica/nspredef.c
index ba1072f..7096bcd 100644
--- a/drivers/acpi/acpica/nspredef.c
+++ b/drivers/acpi/acpica/nspredef.c
@@ -231,6 +231,7 @@
* Note: Package may have been newly created by call above.
*/
if ((*return_object_ptr)->common.type == ACPI_TYPE_PACKAGE) {
+ data->parent_package = *return_object_ptr;
status = acpi_ns_check_package(data, return_object_ptr);
if (ACPI_FAILURE(status)) {
goto exit;
@@ -710,6 +711,7 @@
for (i = 0; i < count; i++) {
sub_package = *elements;
sub_elements = sub_package->package.elements;
+ data->parent_package = sub_package;
/* Each sub-object must be of type Package */
@@ -721,6 +723,7 @@
/* Examine the different types of expected sub-packages */
+ data->parent_package = sub_package;
switch (package->ret_info.type) {
case ACPI_PTYPE2:
case ACPI_PTYPE2_PKG_COUNT:
@@ -800,7 +803,7 @@
/*
* First element is the (Integer) count of elements, including
- * the count field.
+ * the count field (the ACPI name is num_elements)
*/
status = acpi_ns_check_object_type(data, sub_elements,
ACPI_RTYPE_INTEGER,
@@ -822,6 +825,16 @@
expected_count = package->ret_info.count1;
goto package_too_small;
}
+ if (expected_count == 0) {
+ /*
+ * Either the num_entries element was originally zero or it was
+ * a NULL element and repaired to an Integer of value zero.
+ * In either case, repair it by setting num_entries to be the
+ * actual size of the subpackage.
+ */
+ expected_count = sub_package->package.count;
+ (*sub_elements)->integer.value = expected_count;
+ }
/* Check the type of each sub-package element */
@@ -945,10 +958,18 @@
char type_buffer[48]; /* Room for 5 types */
/*
- * If we get a NULL return_object here, it is a NULL package element,
- * and this is always an error.
+ * If we get a NULL return_object here, it is a NULL package element.
+ * Since all extraneous NULL package elements were removed earlier by a
+ * call to acpi_ns_remove_null_elements, this is an unexpected NULL element.
+ * We will attempt to repair it.
*/
if (!return_object) {
+ status = acpi_ns_repair_null_element(data, expected_btypes,
+ package_index,
+ return_object_ptr);
+ if (ACPI_SUCCESS(status)) {
+ return (AE_OK); /* Repair was successful */
+ }
goto type_error_exit;
}