/* Initialize the return value to an invalid object */
info->return_object = NULL;
+ info->param_count = 0;
/*
* Get the actual namespace node for the target object. Handles these cases:
return_ACPI_STATUS(AE_NULL_OBJECT);
}
- /*
- * Calculate the number of arguments being passed to the method
- */
+ /* Count the number of arguments being passed to the method */
- info->param_count = 0;
if (info->parameters) {
- while (info->parameters[info->param_count])
+ while (info->parameters[info->param_count]) {
+ if (info->param_count > ACPI_METHOD_MAX_ARG) {
+ return_ACPI_STATUS(AE_LIMIT);
+ }
info->param_count++;
+ }
}
- /*
- * Warning if too few or too many arguments have been passed by the
- * caller. We don't want to abort here with an error because an
- * incorrect number of arguments may not cause the method to fail.
- * However, the method will fail if there are too few arguments passed
- * and the method attempts to use one of the missing ones.
- */
-
- if (info->param_count < info->obj_desc->method.param_count) {
- ACPI_WARNING((AE_INFO,
- "Insufficient arguments - "
- "method [%4.4s] needs %d, found %d",
- acpi_ut_get_node_name(info->resolved_node),
- info->obj_desc->method.param_count,
- info->param_count));
- } else if (info->param_count >
- info->obj_desc->method.param_count) {
- ACPI_WARNING((AE_INFO,
- "Excess arguments - "
- "method [%4.4s] needs %d, found %d",
- acpi_ut_get_node_name(info->
- resolved_node),
- info->obj_desc->method.param_count,
- info->param_count));
- }
ACPI_DUMP_PATHNAME(info->resolved_node, "Execute Method:",
ACPI_LV_INFO, _COMPONENT);
}
}
- /* Validation of return values for ACPI-predefined methods and objects */
-
- if ((status == AE_OK) || (status == AE_CTRL_RETURN_VALUE)) {
- /*
- * If this is the first evaluation, check the return value. This
- * ensures that any warnings will only be emitted during the very
- * first evaluation of the object.
- */
- if (!(node->flags & ANOBJ_EVALUATED)) {
- /*
- * Check for a predefined ACPI name. If found, validate the
- * returned object.
- *
- * Note: Ignore return status for now, emit warnings if there are
- * problems with the returned object. May change later to abort
- * the method on invalid return object.
- */
- (void)acpi_ns_check_predefined_names(node,
- &info->return_object);
- }
-
- /* Mark the node as having been evaluated */
-
- node->flags |= ANOBJ_EVALUATED;
- }
+ /*
+ * Check input argument count against the ASL-defined count for a method.
+ * Also check predefined names: argument count and return value against
+ * the ACPI specification. Some incorrect return value types are repaired.
+ */
+ (void)acpi_ns_check_predefined_names(node, info->param_count,
+ status, &info->return_object);
/* Check if there is a return value that must be dealt with */
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;
/* Match the name for this method/object against the predefined list */
predefined = acpi_ns_check_for_predefined_name(node);
- if (!predefined) {
-
- /* Name was not one of the predefined names */
-
- return (AE_OK);
- }
/* Get the full pathname to the object, for use in error messages */
}
/*
- * Check that the parameter count for this method is in accordance
- * with the ACPI specification.
+ * 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, predefined);
+ 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
* We have a return value, but if one wasn't expected, just exit, this is
* not a problem
*
- * For example, if "Implicit return value" is enabled, methods will
+ * For example, if the "Implicit Return" feature is enabled, methods will
* always return a value
*/
if (!predefined->info.expected_btypes) {
}
exit:
- if (pathname) {
+ if (pathname != predefined->info.name) {
ACPI_FREE(pathname);
}
*
* 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
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;
- /*
- * Check that the ASL-defined parameter count is what is expected for
- * this predefined name.
- *
- * Methods have 0-7 parameters. All other types have zero.
- */
+ /* 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;
}
- /* Validate parameter count - allow two different legal counts (_SCP) */
+ /* 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, expected %d",
+ "%s: Parameter count mismatch - ASL declared %d, ACPI requires %d",
pathname, param_count, required_params_current));
}
}
git.samba.org / sfrench / cifs-2.6.git / commitdiff