ACPICA: Fix possible negative array index in acpi_ut_validate_exception

Added NULL fields to the exception string arrays to eliminate
the -1 subtraction on the SubStatus field.

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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>

1 files changed, 5 insertions, 9 deletions

diff --git a/drivers/acpi/utilities/utmisc.c b/drivers/acpi/utilities/utmisc.c
index 1f057b71db1a..47354d9b0e56 100644
--- a/drivers/acpi/utilities/utmisc.c
+++ b/drivers/acpi/utilities/utmisc.c
@@ -64,7 +64,7 @@ ACPI_MODULE_NAME("utmisc")
  ******************************************************************************/
 const char *acpi_ut_validate_exception(acpi_status status)
 {
-        acpi_status sub_status;
+        u32 sub_status;
         const char *exception = NULL;
 
         ACPI_FUNCTION_ENTRY();
@@ -85,32 +85,28 @@ const char *acpi_ut_validate_exception(acpi_status status)
         case AE_CODE_PROGRAMMER:
 
                 if (sub_status <= AE_CODE_PGM_MAX) {
-                        exception =
-                            acpi_gbl_exception_names_pgm[sub_status - 1];
+                        exception = acpi_gbl_exception_names_pgm[sub_status];
                 }
                 break;
 
         case AE_CODE_ACPI_TABLES:
 
                 if (sub_status <= AE_CODE_TBL_MAX) {
-                        exception =
-                            acpi_gbl_exception_names_tbl[sub_status - 1];
+                        exception = acpi_gbl_exception_names_tbl[sub_status];
                 }
                 break;
 
         case AE_CODE_AML:
 
                 if (sub_status <= AE_CODE_AML_MAX) {
-                        exception =
-                            acpi_gbl_exception_names_aml[sub_status - 1];
+                        exception = acpi_gbl_exception_names_aml[sub_status];
                 }
                 break;
 
         case AE_CODE_CONTROL:
 
                 if (sub_status <= AE_CODE_CTRL_MAX) {
-                        exception =
-                            acpi_gbl_exception_names_ctrl[sub_status - 1];
+                        exception = acpi_gbl_exception_names_ctrl[sub_status];
                 }
                 break;