From df5b358af6e12b68f1fd38524b8056ff1d49b4b9 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Fri, 6 Aug 2004 21:29:22 +0000
Subject: [PATCH] Backport SF bug #1004088:     big code objects (>64K) may be
 optimized incorrectly

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

diff --git a/Python/compile.c b/Python/compile.c
index f2e04b00c1b0..21cea42f7ef5 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -345,6 +345,10 @@ optimize_code(PyObject *code, PyObject* consts)
 	codestr = memcpy(codestr, PyString_AS_STRING(code), codelen);
 	assert(PyTuple_Check(consts));
 
+	/* Avoid situations where jump retargeting could overflow */
+	if (codelen > 65000)
+		goto exitUnchanged;
+
 	for (i=0 ; i<codelen-7 ; i += HAS_ARG(codestr[i]) ? 3 : 1) {
 		opcode = codestr[i];
 		switch (opcode) {
-- 
2.47.3