ACPICA: Fix possible memory leak for module-level code execution

An object can be leaked for each block of executed module-level
code if the interpreter slack mode is enabled. The change deletes
any implicitly returned object in this case.

Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/acpi/acpica/nseval.c b/drivers/acpi/acpica/nseval.c
index f771e978c403..65e0d1a260ea 100644
--- a/drivers/acpi/acpica/nseval.c
+++ b/drivers/acpi/acpica/nseval.c
@@ -415,6 +415,12 @@ acpi_ns_exec_module_code(union acpi_operand_object *method_obj,
         ACPI_DEBUG_PRINT((ACPI_DB_INIT, "Executed module-level code at %p\n",
                           method_obj->method.aml_start));
 
+        /* Delete a possible implicit return value (in slack mode) */
+
+        if (info->return_object) {
+                acpi_ut_remove_reference(info->return_object);
+        }
+
         /* Detach the temporary method object */
 
         acpi_ns_detach_object(parent_node);