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authorBob Moore <robert.moore@intel.com>2009-11-12 04:36:00 +0300
committerLen Brown <len.brown@intel.com>2009-11-25 05:31:10 +0300
commit419a909dd10142d015dd96457db1b1eda643f89e (patch)
treeda9db6fc6e669909b08adae1366a34161faef113 /drivers/acpi/acpica/nspredef.c
parent2263576cfc6e8f6ab038126c3254404b9fcb1c33 (diff)
downloadlinux-419a909dd10142d015dd96457db1b1eda643f89e.tar.xz
ACPICA: Fix possible fault if return Package objects contain NULL elements
For predefined name validation. Also adds a warning if a NULL element is followed by any non-null elements. ACPICA BZ 813, 814. http://www.acpica.org/bugzilla/show_bug.cgi?id=813 http://www.acpica.org/bugzilla/show_bug.cgi?id=814 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>
Diffstat (limited to 'drivers/acpi/acpica/nspredef.c')
-rw-r--r--drivers/acpi/acpica/nspredef.c43
1 files changed, 42 insertions, 1 deletions
diff --git a/drivers/acpi/acpica/nspredef.c b/drivers/acpi/acpica/nspredef.c
index f8427afeebdf..40280981033e 100644
--- a/drivers/acpi/acpica/nspredef.c
+++ b/drivers/acpi/acpica/nspredef.c
@@ -601,7 +601,8 @@ acpi_ns_check_package(struct acpi_predefined_data *data,
* there is only one entry). We may be able to repair this by
* wrapping the returned Package with a new outer Package.
*/
- if ((*elements)->common.type != ACPI_TYPE_PACKAGE) {
+ if (*elements
+ && ((*elements)->common.type != ACPI_TYPE_PACKAGE)) {
/* Create the new outer package and populate it */
@@ -673,6 +674,7 @@ acpi_ns_check_package_list(struct acpi_predefined_data *data,
union acpi_operand_object *sub_package;
union acpi_operand_object **sub_elements;
acpi_status status;
+ u8 non_trailing_null = FALSE;
u32 expected_count;
u32 i;
u32 j;
@@ -680,6 +682,45 @@ acpi_ns_check_package_list(struct acpi_predefined_data *data,
/* Validate each sub-Package in the parent Package */
for (i = 0; i < count; i++) {
+ /*
+ * Handling for NULL package elements. For now, we will simply allow
+ * a parent package with trailing NULL elements. This can happen if
+ * the package was defined to be longer than the initializer list.
+ * This is legal as per the ACPI specification. It is often used
+ * to allow for dynamic initialization of a Package.
+ *
+ * A future enhancement may be to simply truncate the package to
+ * remove the trailing NULL elements.
+ */
+ if (!(*elements)) {
+ if (!non_trailing_null) {
+
+ /* Ensure the remaining elements are all NULL */
+
+ for (j = 1; j < (count - i + 1); j++) {
+ if (elements[j]) {
+ non_trailing_null = TRUE;
+ }
+ }
+
+ if (!non_trailing_null) {
+
+ /* Ignore the trailing NULL elements */
+
+ return (AE_OK);
+ }
+ }
+
+ /* There are trailing non-null elements, issue warning */
+
+ ACPI_WARN_PREDEFINED((AE_INFO, data->pathname,
+ data->node_flags,
+ "Found NULL element at package index %u",
+ i));
+ elements++;
+ continue;
+ }
+
sub_package = *elements;
sub_elements = sub_package->package.elements;