From 6b64a6803e17805a6a4fb9a82f7ec26bdc30a6d5 Mon Sep 17 00:00:00 2001
From: Victor Stinner <victor.stinner@gmail.com>
Date: Thu, 11 Jul 2013 22:50:45 +0200
Subject: [PATCH] Issue #18408: Fix compiler_import() to handle
 PyUnicode_Substring() failure properly

---
 Python/compile.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Python/compile.c b/Python/compile.c
index 4fc75759260..d11e3abeaa4 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -2316,8 +2316,11 @@ compiler_import(struct compiler *c, stmt_ty s)
             identifier tmp = alias->name;
             Py_ssize_t dot = PyUnicode_FindChar(
                 alias->name, '.', 0, PyUnicode_GET_LENGTH(alias->name), 1);
-            if (dot != -1)
+            if (dot != -1) {
                 tmp = PyUnicode_Substring(alias->name, 0, dot);
+                if (tmp == NULL)
+                    return 0;
+            }
             r = compiler_nameop(c, tmp, Store);
             if (dot != -1) {
                 Py_DECREF(tmp);