From 43d8195a704686842185b1821d2b26aa8210cc00 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Wed, 17 Jul 2013 00:57:58 +0200
Subject: Issue #18408: Handle PyArena_AddPyObject() failure in ast.c

PyList_Append() (called by PyArena_AddPyObject()) can fail because of a
MemoryError for example.
---
 Python/ast.c | 25 ++++++++++++++++++++-----
 1 file changed, 20 insertions(+), 5 deletions(-)

diff --git a/Python/ast.c b/Python/ast.c
index 4d517b7..afdb199 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -560,7 +560,10 @@ new_identifier(const char *n, struct compiling *c)
         id = id2;
     }
     PyUnicode_InternInPlace(&id);
-    PyArena_AddPyObject(c->c_arena, id);
+    if (PyArena_AddPyObject(c->c_arena, id) < 0) {
+        Py_DECREF(id);
+        return NULL;
+    }
     return id;
 }
 
@@ -1847,7 +1850,10 @@ ast_for_atom(struct compiling *c, const node *n)
             }
             return NULL;
         }
-        PyArena_AddPyObject(c->c_arena, str);
+        if (PyArena_AddPyObject(c->c_arena, str) < 0) {
+            Py_DECREF(str);
+            return NULL;
+        }
         if (bytesmode)
             return Bytes(str, LINENO(n), n->n_col_offset, c->c_arena);
         else
@@ -1858,7 +1864,10 @@ ast_for_atom(struct compiling *c, const node *n)
         if (!pynum)
             return NULL;
 
-        PyArena_AddPyObject(c->c_arena, pynum);
+        if (PyArena_AddPyObject(c->c_arena, pynum) < 0) {
+            Py_DECREF(pynum);
+            return NULL;
+        }
         return Num(pynum, LINENO(n), n->n_col_offset, c->c_arena);
     }
     case ELLIPSIS: /* Ellipsis */
@@ -2845,13 +2854,19 @@ alias_for_import_name(struct compiling *c, const node *n, int store)
                     return NULL;
                 str = uni;
                 PyUnicode_InternInPlace(&str);
-                PyArena_AddPyObject(c->c_arena, str);
+                if (PyArena_AddPyObject(c->c_arena, str) < 0) {
+                    Py_DECREF(str);
+                    return NULL;
+                }
                 return alias(str, NULL, c->c_arena);
             }
             break;
         case STAR:
             str = PyUnicode_InternFromString("*");
-            PyArena_AddPyObject(c->c_arena, str);
+            if (PyArena_AddPyObject(c->c_arena, str) < 0) {
+                Py_DECREF(str);
+                return NULL;
+            }
             return alias(str, NULL, c->c_arena);
         default:
             PyErr_Format(PyExc_SystemError,
-- 
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