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linux/drivers/acpi/acpica/nspredef.c
Bob Moore 65259094c3 ACPICA: Fix possible dereference of null pointer 
Fix dereference of possibly null pointer "Predefined" in the case
where the method is not one of the predefined methods.

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>
2009-05-27 00:30:49 -04:00

1073 lines
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/******************************************************************************
*
* Module Name: nspredef - Validation of ACPI predefined methods and objects
* $Revision: 1.1 $
*
*****************************************************************************/
/*
* Copyright (C) 2000 - 2008, Intel Corp.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
* 3. Neither the names of the above-listed copyright holders nor the names
* of any contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* Alternatively, this software may be distributed under the terms of the
* GNU General Public License ("GPL") version 2 as published by the Free
* Software Foundation.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*/
#include <acpi/acpi.h>
#include "accommon.h"
#include "acnamesp.h"
#include "acpredef.h"
#define _COMPONENT ACPI_NAMESPACE
ACPI_MODULE_NAME("nspredef")
/*******************************************************************************
*
* This module validates predefined ACPI objects that appear in the namespace,
* at the time they are evaluated (via acpi_evaluate_object). The purpose of this
* validation is to detect problems with BIOS-exposed predefined ACPI objects
* before the results are returned to the ACPI-related drivers.
*
* There are several areas that are validated:
*
* 1) The number of input arguments as defined by the method/object in the
* ASL is validated against the ACPI specification.
* 2) The type of the return object (if any) is validated against the ACPI
* specification.
* 3) For returned package objects, the count of package elements is
* validated, as well as the type of each package element. Nested
* packages are supported.
*
* For any problems found, a warning message is issued.
*
******************************************************************************/
/* Local prototypes */
static acpi_status
acpi_ns_check_package(char *pathname,
union acpi_operand_object **return_object_ptr,
const union acpi_predefined_info *predefined);
static acpi_status
acpi_ns_check_package_elements(char *pathname,
union acpi_operand_object **elements,
u8 type1,
u32 count1,
u8 type2, u32 count2, u32 start_index);
static acpi_status
acpi_ns_check_object_type(char *pathname,
union acpi_operand_object **return_object_ptr,
u32 expected_btypes, u32 package_index);
static acpi_status
acpi_ns_check_reference(char *pathname,
union acpi_operand_object *return_object);
static acpi_status
acpi_ns_repair_object(u32 expected_btypes,
u32 package_index,
union acpi_operand_object **return_object_ptr);
/*
* Names for the types that can be returned by the predefined objects.
* Used for warning messages. Must be in the same order as the ACPI_RTYPEs
*/
static const char *acpi_rtype_names[] = {
"/Integer",
"/String",
"/Buffer",
"/Package",
"/Reference",
};
#define ACPI_NOT_PACKAGE ACPI_UINT32_MAX
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_predefined_names
*
* PARAMETERS: Node - Namespace node for the method/object
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status
*
* DESCRIPTION: Check an ACPI name for a match in the predefined name list.
*
******************************************************************************/
acpi_status
acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
u32 user_param_count,
acpi_status return_status,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
acpi_status status = AE_OK;
const union acpi_predefined_info *predefined;
char *pathname;
/* Match the name for this method/object against the predefined list */
predefined = acpi_ns_check_for_predefined_name(node);
/* Get the full pathname to the object, for use in error messages */
pathname = acpi_ns_get_external_pathname(node);
if (!pathname) {
return AE_OK; /* Could not get pathname, ignore */
}
/*
* Check that the parameter count for this method matches the ASL
* definition. For predefined names, ensure that both the caller and
* the method itself are in accordance with the ACPI specification.
*/
acpi_ns_check_parameter_count(pathname, node, user_param_count,
predefined);
/* If not a predefined name, we cannot validate the return object */
if (!predefined) {
goto exit;
}
/* If the method failed, we cannot validate the return object */
if ((return_status != AE_OK) && (return_status != AE_CTRL_RETURN_VALUE)) {
goto exit;
}
/*
* Only validate the return value on the first successful evaluation of
* the method. This ensures that any warnings will only be emitted during
* the very first evaluation of the method/object.
*/
if (node->flags & ANOBJ_EVALUATED) {
goto exit;
}
/* Mark the node as having been successfully evaluated */
node->flags |= ANOBJ_EVALUATED;
/*
* If there is no return value, check if we require a return value for
* this predefined name. Either one return value is expected, or none,
* for both methods and other objects.
*
* Exit now if there is no return object. Warning if one was expected.
*/
if (!return_object) {
if ((predefined->info.expected_btypes) &&
(!(predefined->info.expected_btypes & ACPI_RTYPE_NONE))) {
ACPI_ERROR((AE_INFO,
"%s: Missing expected return value",
pathname));
status = AE_AML_NO_RETURN_VALUE;
}
goto exit;
}
/*
* We have a return value, but if one wasn't expected, just exit, this is
* not a problem
*
* For example, if the "Implicit Return" feature is enabled, methods will
* always return a value
*/
if (!predefined->info.expected_btypes) {
goto exit;
}
/*
* Check that the type of the return object is what is expected for
* this predefined name
*/
status = acpi_ns_check_object_type(pathname, return_object_ptr,
predefined->info.expected_btypes,
ACPI_NOT_PACKAGE);
if (ACPI_FAILURE(status)) {
goto exit;
}
/* For returned Package objects, check the type of all sub-objects */
if (return_object->common.type == ACPI_TYPE_PACKAGE) {
status =
acpi_ns_check_package(pathname, return_object_ptr,
predefined);
}
exit:
ACPI_FREE(pathname);
return (status);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_parameter_count
*
* PARAMETERS: Pathname - Full pathname to the node (for error msgs)
* Node - Namespace node for the method/object
* user_param_count - Number of args passed in by the caller
* Predefined - Pointer to entry in predefined name table
*
* RETURN: None
*
* DESCRIPTION: Check that the declared (in ASL/AML) parameter count for a
* predefined name is what is expected (i.e., what is defined in
* the ACPI specification for this predefined name.)
*
******************************************************************************/
void
acpi_ns_check_parameter_count(char *pathname,
struct acpi_namespace_node *node,
u32 user_param_count,
const union acpi_predefined_info *predefined)
{
u32 param_count;
u32 required_params_current;
u32 required_params_old;
/* Methods have 0-7 parameters. All other types have zero. */
param_count = 0;
if (node->type == ACPI_TYPE_METHOD) {
param_count = node->object->method.param_count;
}
/* Argument count check for non-predefined methods/objects */
if (!predefined) {
/*
* Warning if too few or too many arguments have been passed by the
* caller. An incorrect number of arguments may not cause the method
* to fail. However, the method will fail if there are too few
* arguments and the method attempts to use one of the missing ones.
*/
if (user_param_count < param_count) {
ACPI_WARNING((AE_INFO,
"%s: Insufficient arguments - needs %d, found %d",
pathname, param_count, user_param_count));
} else if (user_param_count > param_count) {
ACPI_WARNING((AE_INFO,
"%s: Excess arguments - needs %d, found %d",
pathname, param_count, user_param_count));
}
return;
}
/* Allow two different legal argument counts (_SCP, etc.) */
required_params_current = predefined->info.param_count & 0x0F;
required_params_old = predefined->info.param_count >> 4;
if (user_param_count != ACPI_UINT32_MAX) {
/* Validate the user-supplied parameter count */
if ((user_param_count != required_params_current) &&
(user_param_count != required_params_old)) {
ACPI_WARNING((AE_INFO,
"%s: Parameter count mismatch - "
"caller passed %d, ACPI requires %d",
pathname, user_param_count,
required_params_current));
}
}
/*
* Only validate the argument count on the first successful evaluation of
* the method. This ensures that any warnings will only be emitted during
* the very first evaluation of the method/object.
*/
if (node->flags & ANOBJ_EVALUATED) {
return;
}
/*
* Check that the ASL-defined parameter count is what is expected for
* this predefined name.
*/
if ((param_count != required_params_current) &&
(param_count != required_params_old)) {
ACPI_WARNING((AE_INFO,
"%s: Parameter count mismatch - ASL declared %d, ACPI requires %d",
pathname, param_count, required_params_current));
}
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_for_predefined_name
*
* PARAMETERS: Node - Namespace node for the method/object
*
* RETURN: Pointer to entry in predefined table. NULL indicates not found.
*
* DESCRIPTION: Check an object name against the predefined object list.
*
******************************************************************************/
const union acpi_predefined_info *acpi_ns_check_for_predefined_name(struct
acpi_namespace_node
*node)
{
const union acpi_predefined_info *this_name;
/* Quick check for a predefined name, first character must be underscore */
if (node->name.ascii[0] != '_') {
return (NULL);
}
/* Search info table for a predefined method/object name */
this_name = predefined_names;
while (this_name->info.name[0]) {
if (ACPI_COMPARE_NAME(node->name.ascii, this_name->info.name)) {
/* Return pointer to this table entry */
return (this_name);
}
/*
* Skip next entry in the table if this name returns a Package
* (next entry contains the package info)
*/
if (this_name->info.expected_btypes & ACPI_RTYPE_PACKAGE) {
this_name++;
}
this_name++;
}
return (NULL);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_package
*
* PARAMETERS: Pathname - Full pathname to the node (for error msgs)
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
* Predefined - Pointer to entry in predefined name table
*
* RETURN: Status
*
* DESCRIPTION: Check a returned package object for the correct count and
* correct type of all sub-objects.
*
******************************************************************************/
static acpi_status
acpi_ns_check_package(char *pathname,
union acpi_operand_object **return_object_ptr,
const union acpi_predefined_info *predefined)
{
union acpi_operand_object *return_object = *return_object_ptr;
const union acpi_predefined_info *package;
union acpi_operand_object *sub_package;
union acpi_operand_object **elements;
union acpi_operand_object **sub_elements;
acpi_status status;
u32 expected_count;
u32 count;
u32 i;
u32 j;
ACPI_FUNCTION_NAME(ns_check_package);
/* The package info for this name is in the next table entry */
package = predefined + 1;
ACPI_DEBUG_PRINT((ACPI_DB_NAMES,
"%s Validating return Package of Type %X, Count %X\n",
pathname, package->ret_info.type,
return_object->package.count));
/* Extract package count and elements array */
elements = return_object->package.elements;
count = return_object->package.count;
/* The package must have at least one element, else invalid */
if (!count) {
ACPI_WARNING((AE_INFO,
"%s: Return Package has no elements (empty)",
pathname));
return (AE_AML_OPERAND_VALUE);
}
/*
* Decode the type of the expected package contents
*
* PTYPE1 packages contain no subpackages
* PTYPE2 packages contain sub-packages
*/
switch (package->ret_info.type) {
case ACPI_PTYPE1_FIXED:
/*
* The package count is fixed and there are no sub-packages
*
* If package is too small, exit.
* If package is larger than expected, issue warning but continue
*/
expected_count =
package->ret_info.count1 + package->ret_info.count2;
if (count < expected_count) {
goto package_too_small;
} else if (count > expected_count) {
ACPI_WARNING((AE_INFO,
"%s: Return Package is larger than needed - "
"found %u, expected %u", pathname, count,
expected_count));
}
/* Validate all elements of the returned package */
status = acpi_ns_check_package_elements(pathname, elements,
package->ret_info.
object_type1,
package->ret_info.
count1,
package->ret_info.
object_type2,
package->ret_info.
count2, 0);
if (ACPI_FAILURE(status)) {
return (status);
}
break;
case ACPI_PTYPE1_VAR:
/*
* The package count is variable, there are no sub-packages, and all
* elements must be of the same type
*/
for (i = 0; i < count; i++) {
status = acpi_ns_check_object_type(pathname, elements,
package->ret_info.
object_type1, i);
if (ACPI_FAILURE(status)) {
return (status);
}
elements++;
}
break;
case ACPI_PTYPE1_OPTION:
/*
* The package count is variable, there are no sub-packages. There are
* a fixed number of required elements, and a variable number of
* optional elements.
*
* Check if package is at least as large as the minimum required
*/
expected_count = package->ret_info3.count;
if (count < expected_count) {
goto package_too_small;
}
/* Variable number of sub-objects */
for (i = 0; i < count; i++) {
if (i < package->ret_info3.count) {
/* These are the required package elements (0, 1, or 2) */
status =
acpi_ns_check_object_type(pathname,
elements,
package->
ret_info3.
object_type[i],
i);
if (ACPI_FAILURE(status)) {
return (status);
}
} else {
/* These are the optional package elements */
status =
acpi_ns_check_object_type(pathname,
elements,
package->
ret_info3.
tail_object_type,
i);
if (ACPI_FAILURE(status)) {
return (status);
}
}
elements++;
}
break;
case ACPI_PTYPE2_PKG_COUNT:
/* First element is the (Integer) count of sub-packages to follow */
status = acpi_ns_check_object_type(pathname, elements,
ACPI_RTYPE_INTEGER, 0);
if (ACPI_FAILURE(status)) {
return (status);
}
/*
* Count cannot be larger than the parent package length, but allow it
* to be smaller. The >= accounts for the Integer above.
*/
expected_count = (u32) (*elements)->integer.value;
if (expected_count >= count) {
goto package_too_small;
}
count = expected_count;
elements++;
/* Now we can walk the sub-packages */
/*lint -fallthrough */
case ACPI_PTYPE2:
case ACPI_PTYPE2_FIXED:
case ACPI_PTYPE2_MIN:
case ACPI_PTYPE2_COUNT:
/*
* These types all return a single package that consists of a variable
* number of sub-packages
*/
for (i = 0; i < count; i++) {
sub_package = *elements;
sub_elements = sub_package->package.elements;
/* Each sub-object must be of type Package */
status =
acpi_ns_check_object_type(pathname, &sub_package,
ACPI_RTYPE_PACKAGE, i);
if (ACPI_FAILURE(status)) {
return (status);
}
/* Examine the different types of sub-packages */
switch (package->ret_info.type) {
case ACPI_PTYPE2:
case ACPI_PTYPE2_PKG_COUNT:
/* Each subpackage has a fixed number of elements */
expected_count =
package->ret_info.count1 +
package->ret_info.count2;
if (sub_package->package.count !=
expected_count) {
count = sub_package->package.count;
goto package_too_small;
}
status =
acpi_ns_check_package_elements(pathname,
sub_elements,
package->
ret_info.
object_type1,
package->
ret_info.
count1,
package->
ret_info.
object_type2,
package->
ret_info.
count2, 0);
if (ACPI_FAILURE(status)) {
return (status);
}
break;
case ACPI_PTYPE2_FIXED:
/* Each sub-package has a fixed length */
expected_count = package->ret_info2.count;
if (sub_package->package.count < expected_count) {
count = sub_package->package.count;
goto package_too_small;
}
/* Check the type of each sub-package element */
for (j = 0; j < expected_count; j++) {
status =
acpi_ns_check_object_type(pathname,
&sub_elements[j],
package->ret_info2.object_type[j], j);
if (ACPI_FAILURE(status)) {
return (status);
}
}
break;
case ACPI_PTYPE2_MIN:
/* Each sub-package has a variable but minimum length */
expected_count = package->ret_info.count1;
if (sub_package->package.count < expected_count) {
count = sub_package->package.count;
goto package_too_small;
}
/* Check the type of each sub-package element */
status =
acpi_ns_check_package_elements(pathname,
sub_elements,
package->
ret_info.
object_type1,
sub_package->
package.
count, 0, 0,
0);
if (ACPI_FAILURE(status)) {
return (status);
}
break;
case ACPI_PTYPE2_COUNT:
/* First element is the (Integer) count of elements to follow */
status =
acpi_ns_check_object_type(pathname,
sub_elements,
ACPI_RTYPE_INTEGER,
0);
if (ACPI_FAILURE(status)) {
return (status);
}
/* Make sure package is large enough for the Count */
expected_count =
(u32) (*sub_elements)->integer.value;
if (sub_package->package.count < expected_count) {
count = sub_package->package.count;
goto package_too_small;
}
/* Check the type of each sub-package element */
status =
acpi_ns_check_package_elements(pathname,
(sub_elements
+ 1),
package->
ret_info.
object_type1,
(expected_count
- 1), 0, 0,
1);
if (ACPI_FAILURE(status)) {
return (status);
}
break;
default:
break;
}
elements++;
}
break;
default:
/* Should not get here if predefined info table is correct */
ACPI_WARNING((AE_INFO,
"%s: Invalid internal return type in table entry: %X",
pathname, package->ret_info.type));
return (AE_AML_INTERNAL);
}
return (AE_OK);
package_too_small:
/* Error exit for the case with an incorrect package count */
ACPI_WARNING((AE_INFO, "%s: Return Package is too small - "
"found %u, expected %u", pathname, count,
expected_count));
return (AE_AML_OPERAND_VALUE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_package_elements
*
* PARAMETERS: Pathname - Full pathname to the node (for error msgs)
* Elements - Pointer to the package elements array
* Type1 - Object type for first group
* Count1 - Count for first group
* Type2 - Object type for second group
* Count2 - Count for second group
* start_index - Start of the first group of elements
*
* RETURN: Status
*
* DESCRIPTION: Check that all elements of a package are of the correct object
* type. Supports up to two groups of different object types.
*
******************************************************************************/
static acpi_status
acpi_ns_check_package_elements(char *pathname,
union acpi_operand_object **elements,
u8 type1,
u32 count1,
u8 type2, u32 count2, u32 start_index)
{
union acpi_operand_object **this_element = elements;
acpi_status status;
u32 i;
/*
* Up to two groups of package elements are supported by the data
* structure. All elements in each group must be of the same type.
* The second group can have a count of zero.
*/
for (i = 0; i < count1; i++) {
status = acpi_ns_check_object_type(pathname, this_element,
type1, i + start_index);
if (ACPI_FAILURE(status)) {
return (status);
}
this_element++;
}
for (i = 0; i < count2; i++) {
status = acpi_ns_check_object_type(pathname, this_element,
type2,
(i + count1 + start_index));
if (ACPI_FAILURE(status)) {
return (status);
}
this_element++;
}
return (AE_OK);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_object_type
*
* PARAMETERS: Pathname - Full pathname to the node (for error msgs)
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
* expected_btypes - Bitmap of expected return type(s)
* package_index - Index of object within parent package (if
* applicable - ACPI_NOT_PACKAGE otherwise)
*
* RETURN: Status
*
* DESCRIPTION: Check the type of the return object against the expected object
* type(s). Use of Btype allows multiple expected object types.
*
******************************************************************************/
static acpi_status
acpi_ns_check_object_type(char *pathname,
union acpi_operand_object **return_object_ptr,
u32 expected_btypes, u32 package_index)
{
union acpi_operand_object *return_object = *return_object_ptr;
acpi_status status = AE_OK;
u32 return_btype;
char type_buffer[48]; /* Room for 5 types */
u32 this_rtype;
u32 i;
u32 j;
/*
* If we get a NULL return_object here, it is a NULL package element,
* and this is always an error.
*/
if (!return_object) {
goto type_error_exit;
}
/* A Namespace node should not get here, but make sure */
if (ACPI_GET_DESCRIPTOR_TYPE(return_object) == ACPI_DESC_TYPE_NAMED) {
ACPI_WARNING((AE_INFO,
"%s: Invalid return type - Found a Namespace node [%4.4s] type %s",
pathname, return_object->node.name.ascii,
acpi_ut_get_type_name(return_object->node.type)));
return (AE_AML_OPERAND_TYPE);
}
/*
* Convert the object type (ACPI_TYPE_xxx) to a bitmapped object type.
* The bitmapped type allows multiple possible return types.
*
* Note, the cases below must handle all of the possible types returned
* from all of the predefined names (including elements of returned
* packages)
*/
switch (return_object->common.type) {
case ACPI_TYPE_INTEGER:
return_btype = ACPI_RTYPE_INTEGER;
break;
case ACPI_TYPE_BUFFER:
return_btype = ACPI_RTYPE_BUFFER;
break;
case ACPI_TYPE_STRING:
return_btype = ACPI_RTYPE_STRING;
break;
case ACPI_TYPE_PACKAGE:
return_btype = ACPI_RTYPE_PACKAGE;
break;
case ACPI_TYPE_LOCAL_REFERENCE:
return_btype = ACPI_RTYPE_REFERENCE;
break;
default:
/* Not one of the supported objects, must be incorrect */
goto type_error_exit;
}
/* Is the object one of the expected types? */
if (!(return_btype & expected_btypes)) {
/* Type mismatch -- attempt repair of the returned object */
status = acpi_ns_repair_object(expected_btypes, package_index,
return_object_ptr);
if (ACPI_SUCCESS(status)) {
return (status);
}
goto type_error_exit;
}
/* For reference objects, check that the reference type is correct */
if (return_object->common.type == ACPI_TYPE_LOCAL_REFERENCE) {
status = acpi_ns_check_reference(pathname, return_object);
}
return (status);
type_error_exit:
/* Create a string with all expected types for this predefined object */
j = 1;
type_buffer[0] = 0;
this_rtype = ACPI_RTYPE_INTEGER;
for (i = 0; i < ACPI_NUM_RTYPES; i++) {
/* If one of the expected types, concatenate the name of this type */
if (expected_btypes & this_rtype) {
ACPI_STRCAT(type_buffer, &acpi_rtype_names[i][j]);
j = 0; /* Use name separator from now on */
}
this_rtype <<= 1; /* Next Rtype */
}
if (package_index == ACPI_NOT_PACKAGE) {
ACPI_WARNING((AE_INFO,
"%s: Return type mismatch - found %s, expected %s",
pathname,
acpi_ut_get_object_type_name(return_object),
type_buffer));
} else {
ACPI_WARNING((AE_INFO,
"%s: Return Package type mismatch at index %u - "
"found %s, expected %s", pathname, package_index,
acpi_ut_get_object_type_name(return_object),
type_buffer));
}
return (AE_AML_OPERAND_TYPE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_check_reference
*
* PARAMETERS: Pathname - Full pathname to the node (for error msgs)
* return_object - Object returned from the evaluation of a
* method or object
*
* RETURN: Status
*
* DESCRIPTION: Check a returned reference object for the correct reference
* type. The only reference type that can be returned from a
* predefined method is a named reference. All others are invalid.
*
******************************************************************************/
static acpi_status
acpi_ns_check_reference(char *pathname,
union acpi_operand_object *return_object)
{
/*
* Check the reference object for the correct reference type (opcode).
* The only type of reference that can be converted to an union acpi_object is
* a reference to a named object (reference class: NAME)
*/
if (return_object->reference.class == ACPI_REFCLASS_NAME) {
return (AE_OK);
}
ACPI_WARNING((AE_INFO,
"%s: Return type mismatch - "
"unexpected reference object type [%s] %2.2X",
pathname, acpi_ut_get_reference_name(return_object),
return_object->reference.class));
return (AE_AML_OPERAND_TYPE);
}
/*******************************************************************************
*
* FUNCTION: acpi_ns_repair_object
*
* PARAMETERS: Pathname - Full pathname to the node (for error msgs)
* package_index - Used to determine if target is in a package
* return_object_ptr - Pointer to the object returned from the
* evaluation of a method or object
*
* RETURN: Status. AE_OK if repair was successful.
*
* DESCRIPTION: Attempt to repair/convert a return object of a type that was
* not expected.
*
******************************************************************************/
static acpi_status
acpi_ns_repair_object(u32 expected_btypes,
u32 package_index,
union acpi_operand_object **return_object_ptr)
{
union acpi_operand_object *return_object = *return_object_ptr;
union acpi_operand_object *new_object;
acpi_size length;
switch (return_object->common.type) {
case ACPI_TYPE_BUFFER:
if (!(expected_btypes & ACPI_RTYPE_STRING)) {
return (AE_AML_OPERAND_TYPE);
}
/*
* Have a Buffer, expected a String, convert. Use a to_string
* conversion, no transform performed on the buffer data. The best
* example of this is the _BIF method, where the string data from
* the battery is often (incorrectly) returned as buffer object(s).
*/
length = 0;
while ((length < return_object->buffer.length) &&
(return_object->buffer.pointer[length])) {
length++;
}
/* Allocate a new string object */
new_object = acpi_ut_create_string_object(length);
if (!new_object) {
return (AE_NO_MEMORY);
}
/*
* Copy the raw buffer data with no transform. String is already NULL
* terminated at Length+1.
*/
ACPI_MEMCPY(new_object->string.pointer,
return_object->buffer.pointer, length);
/* Install the new return object */
acpi_ut_remove_reference(return_object);
*return_object_ptr = new_object;
/*
* If the object is a package element, we need to:
* 1. Decrement the reference count of the orignal object, it was
* incremented when building the package
* 2. Increment the reference count of the new object, it will be
* decremented when releasing the package
*/
if (package_index != ACPI_NOT_PACKAGE) {
acpi_ut_remove_reference(return_object);
acpi_ut_add_reference(new_object);
}
return (AE_OK);
default:
break;
}
return (AE_AML_OPERAND_TYPE);
}
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