bpo-46716: Handle negative timeouts for wait on Windows

Author: jkloth

Lib/subprocess.py

@@ -1483,8 +1483,12 @@ def _wait(self, timeout):
             """Internal implementation of wait() on Windows."""
             if timeout is None:
                 timeout_millis = _winapi.INFINITE
+            elif timeout <= 0:
+                timeout_millis = 0
             else:
                 timeout_millis = int(timeout * 1000)
+                if timeout_millis >= _winapi.INFINITE:
+                    raise OverflowError('timeout too large to convert to C DWORD')
             if self.returncode is None:
                 # API note: Returns immediately if timeout_millis == 0.
                 result = _winapi.WaitForSingleObject(self._handle,