From 9d872e19aac7f09d9b127936427d998bd1e3170c Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Sat, 2 Jul 2011 09:22:13 -0500
Subject: fix possibily uninitialized memory usage (closes #12474)

---
 Python/symtable.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Python/symtable.c b/Python/symtable.c
index 82b1ebb..a0bedfc 100644
--- a/Python/symtable.c
+++ b/Python/symtable.c
@@ -904,10 +904,10 @@ symtable_exit_block(struct symtable *st, void *ast)
     st->st_cur = NULL;
     size = PyList_GET_SIZE(st->st_stack);
     if (size) {
-        st->st_cur = (PySTEntryObject *)PyList_GET_ITEM(st->st_stack,
-                                                        size - 2);
         if (PyList_SetSlice(st->st_stack, size - 1, size, NULL) < 0)
             return 0;
+        if (--size)
+            st->st_cur = (PySTEntryObject *)PyList_GET_ITEM(st->st_stack, size - 1);
     }
     return 1;
 }
-- 
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