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

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(cherry picked from commit 92b5dc780d)

Co-authored-by: Ray Donnelly <mingw.android@gmail.com>
This commit is contained in:
Miss Islington (bot) 2021-07-28 13:18:01 -07:00 • committed by GitHub
parent 369d1480b7
commit bccb7b9509
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2 changed files with 4 additions and 1 deletions
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Misc/NEWS.d/next/Windows/2020-04-13-15-20-28.bpo-40263.1KKEbu.rst Normal file
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@ -0,0 +1,3 @@
This is a follow-on bug from https://bugs.python.org/issue26903. Once that
is applied we run into an off-by-one assertion problem. The assert was not
correct.

2
Modules/_winapi.c
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@ -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);