From: Benjamin Peterson <benjamin@python.org>
Date: Sat, 2 Jul 2011 14:22:13 +0000 (-0500)
Subject: fix possibily uninitialized memory usage (closes #12474)
X-Git-Tag: v3.3.0a1~1982
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=9d872e19aac7f09d9b127936427d998bd1e3170c;p=thirdparty%2FPython%2Fcpython.git

fix possibily uninitialized memory usage (closes #12474)
---

diff --git a/Python/symtable.c b/Python/symtable.c
index 82b1ebb7fa86..a0bedfc767e3 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;
 }