From: Dong-hee Na <donghee.na@python.org>
Date: Thu, 10 Feb 2022 10:10:07 +0000 (+0900)
Subject: bpo-46323: Allow alloca(0) for python callback function of ctypes (GH-31249)
X-Git-Tag: v3.11.0a6~250
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=db052851a70fd95d047c6263fc16a75e4d47b3ed;p=thirdparty%2FPython%2Fcpython.git

bpo-46323: Allow alloca(0) for python callback function of ctypes (GH-31249)
---

diff --git a/Modules/_ctypes/callbacks.c b/Modules/_ctypes/callbacks.c
index 591b944d76fc..6037f5fd8428 100644
--- a/Modules/_ctypes/callbacks.c
+++ b/Modules/_ctypes/callbacks.c
@@ -165,11 +165,7 @@ static void _CallPythonObject(void *mem,
     assert(PyTuple_Check(converters));
     nargs = PyTuple_GET_SIZE(converters);
     assert(nargs <= CTYPES_MAX_ARGCOUNT);
-    PyObject **args = NULL;
-    if (nargs > 0) {
-        args = alloca(nargs * sizeof(PyObject *));
-    }
-
+    PyObject **args = alloca(nargs * sizeof(PyObject *));
     PyObject **cnvs = PySequence_Fast_ITEMS(converters);
     for (i = 0; i < nargs; i++) {
         PyObject *cnv = cnvs[i]; // borrowed ref