SF bug #1004088: big code objects (>64K) may be optimized incorrectly
Will backport.
diff --git a/Python/compile.c b/Python/compile.c
index 0b5ba6c..5c67987 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -379,6 +379,11 @@
if (codestr == NULL)
goto exitUnchanged;
codestr = memcpy(codestr, PyString_AS_STRING(code), codelen);
+
+ /* Avoid situations where jump retargeting could overflow */
+ if (codelen > 65000)
+ goto exitUnchanged;
+
blocks = markblocks(codestr, codelen);
if (blocks == NULL) {
PyMem_Free(codestr);