From c866ac776c65799fc55da397c582ea583330ea9c Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 16 Sep 2003 04:36:33 +0000
Subject: [PATCH] Backport leak fix for new code objects.

---
 Misc/NEWS        |  2 ++
 Python/compile.c | 33 ++++++++++++++++-----------------
 2 files changed, 18 insertions(+), 17 deletions(-)

diff --git a/Misc/NEWS b/Misc/NEWS
index ce1fb7e0d5da..c60771af2ba6 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -12,6 +12,8 @@ What's New in Python 2.3.1?
 Core and builtins
 -----------------
 
+- Fixed a leak when new code objects are instantiated.
+
 - Bug #800796: slice(1).__hash__() now raises a TypeError, unhashable type.
 
 - Bug #603724: Pass an explicit buffer to setvbuf in PyFile_SetBufSize().
diff --git a/Python/compile.c b/Python/compile.c
index 38624d4cceb5..9ac0032bab28 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -104,6 +104,8 @@ code_new(PyTypeObject *type, PyObject *args, PyObject *kw)
 	int nlocals;
 	int stacksize;
 	int flags;
+	PyObject *co;
+	PyObject *empty = NULL;
 	PyObject *code;
 	PyObject *consts;
 	PyObject *names;
@@ -127,31 +129,28 @@ code_new(PyTypeObject *type, PyObject *args, PyObject *kw)
 			      &PyTuple_Type, &cellvars))
 		return NULL;
 
-	if (freevars == NULL || cellvars == NULL) {
-		PyObject *empty = PyTuple_New(0);
-		if (empty == NULL)
-		    return NULL;
-		if (freevars == NULL) {
-		    freevars = empty;
-		    Py_INCREF(freevars);
-		}
-		if (cellvars == NULL) {
-		    cellvars = empty;
-		    Py_INCREF(cellvars);
-		}
-		Py_DECREF(empty);
-	}
-
 	if (!PyObject_CheckReadBuffer(code)) {
 		PyErr_SetString(PyExc_TypeError,
 		  "bytecode object must be a single-segment read-only buffer");
 		return NULL;
 	}
 
-	return (PyObject *)PyCode_New(argcount, nlocals, stacksize, flags,
+	if (freevars == NULL || cellvars == NULL) {
+		empty = PyTuple_New(0);
+		if (empty == NULL)
+			return NULL;
+		if (freevars == NULL)
+			freevars = empty;
+		if (cellvars == NULL)
+			cellvars = empty;
+	}
+
+	co = (PyObject *) PyCode_New(argcount, nlocals, stacksize, flags,
 				      code, consts, names, varnames,
 				      freevars, cellvars, filename, name,
-				      firstlineno, lnotab); 
+				      firstlineno, lnotab);
+	Py_XDECREF(empty);
+	return co;
 }
 
 static void
-- 
2.47.3