Zero-initialize buf. Fixes #3557.
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@ -488,6 +488,7 @@ SHA1_new(PyObject *self, PyObject *args, PyObject *kwdict)
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static char *kwlist[] = {"string", NULL};
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SHA1object *new;
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Py_buffer buf;
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buf.buf = NULL;
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if (!PyArg_ParseTupleAndKeywords(args, kwdict, "|s*:new", kwlist,
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&buf)) {
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