Fix zlib crash from zlib.decompressobj().flush(val) when val was not positive.
It tried to allocate negative or zero memory. That fails.
diff --git a/Modules/zlibmodule.c b/Modules/zlibmodule.c
index f59343f..4f78dbc 100644
--- a/Modules/zlibmodule.c
+++ b/Modules/zlibmodule.c
@@ -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;