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>

1 files changed, 2 insertions, 5 deletions

diff --git a/drivers/acpi/acpica/nspredef.c b/drivers/acpi/acpica/nspredef.c
index d9e8cbc6e679..7f8e066b12a3 100644
--- a/drivers/acpi/acpica/nspredef.c
+++ b/drivers/acpi/acpica/nspredef.c
@@ -144,7 +144,7 @@ acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
 
         pathname = acpi_ns_get_external_pathname(node);
         if (!pathname) {
-                pathname = ACPI_CAST_PTR(char, predefined->info.name);
+                return AE_OK;   /* Could not get pathname, ignore */
         }
 
         /*
@@ -230,10 +230,7 @@ acpi_ns_check_predefined_names(struct acpi_namespace_node *node,
         }
 
       exit:
-        if (pathname != predefined->info.name) {
-                ACPI_FREE(pathname);
-        }
-
+        ACPI_FREE(pathname);
         return (status);
 }