commit bccb7b9509e875ef23ec3225d03214ca047e5b1a
author Miss Islington (bot) <31488909+miss-islington@users.noreply.github.com> Wed Jul 28 13:18:01 2021 -0700
committer GitHub <noreply@github.com> Wed Jul 28 13:18:01 2021 -0700
tree 37a8153a0895a083a8a5bd59e97f996499481e6a
parent 369d1480b7d51b65c08664ecd63c970fb0d573e1

bpo-40263: Fixes an off-by-one error in _winapi_WaitForMultipleObjects_impl (GH-19501)

(cherry picked from commit 92b5dc780db968f6277f42cb06926dddb7475dc6)

Co-authored-by: Ray Donnelly <mingw.android@gmail.com>

Modules/_winapi.c

diff --git a/Modules/_winapi.c b/Modules/_winapi.c
index f341493..bf2498a 100644
--- a/Modules/_winapi.c
+++ b/Modules/_winapi.c
@@ -1722,7 +1722,7 @@ _winapi_WaitForMultipleObjects_impl(PyObject *module, PyObject *handle_seq,
     nhandles = PySequence_Length(handle_seq);
     if (nhandles == -1)
         return NULL;
-    if (nhandles < 0 || nhandles >= MAXIMUM_WAIT_OBJECTS - 1) {
+    if (nhandles < 0 || nhandles > MAXIMUM_WAIT_OBJECTS - 1) {
         PyErr_Format(PyExc_ValueError,
                      "need at most %zd handles, got a sequence of length %zd",
                      MAXIMUM_WAIT_OBJECTS - 1, nhandles);