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--- Modules/zlibmodule.c.orig 2008-04-25 01:47:26.000000000 +0200
+++ Modules/zlibmodule.c 2008-04-25 01:48:17.000000000 +0200
@@ -774,6 +774,10 @@
if (!PyArg_ParseTuple(args, "|i:flush", &length))
return NULL;
+ if (length <= 0) {
+ PyErr_SetString(PyExc_ValueError, "length must be greater than zero");
+ return NULL;
+ }
if (!(retval = PyString_FromStringAndSize(NULL, length)))
return NULL;
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