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[3.10] bpo-40263: Fixes an off-by-one error in _winapi_WaitForMultipleObjects_impl (GH-19501) #27428

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Merged
merged 1 commit into from
Jul 28, 2021
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[3.10] bpo-40263: Fixes an off-by-one error in _winapi_WaitForMultipleObjects_impl (GH-19501) #27428

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3 changes: 3 additions & 0 deletions Misc/NEWS.d/next/Windows/2020-04-13-15-20-28.bpo-40263.1KKEbu.rst
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Original file line number Diff line number Diff line change
@@ -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 changes: 1 addition & 1 deletion Modules/_winapi.c
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Expand Up @@ -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);
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