New submission from Robert <[email protected]>:
When PY_SSIZE_T_CLEAN is not #defined in Py3.10, PyArg_ParseTuple() etc. sets
a SystemError but the return value says 1 (=SUCCESS)!
=> Causes terrific crashes with unfilled variables - instead of a clean Python
exception.
Background: pywin32 suffers in masses from the drop of int support for the
s#/y#/et#... formats in PyArg_ParseTuple() etc. (PY_SSIZE_T_CLEAN is required
in Py3.10). And only part of the source is already PY_SSIZE_T_CLEAN. Now it is
very difficult to even run tests and weed out / check, because of freezes
instead of nice Python exceptions.
=> Instead of preventing such freezes, the PY_SSIZE_T_CLEAN mechanism became
the opposite: a clever trap, a sword of Damocles :)
The cause is in getargs.c:
=================== getargs.c / convertsimple() ====
#define REQUIRE_PY_SSIZE_T_CLEAN \
if (!(flags & FLAG_SIZE_T)) { \
PyErr_SetString(PyExc_SystemError, \
"PY_SSIZE_T_CLEAN macro must be defined for '#'
formats"); \
return NULL; \
}
#define RETURN_ERR_OCCURRED return msgbuf
===================
=> The return NULL is further processed as no msg NULL -> no error.
=> Perhaps it should be a `return converterr(...)` or `return
sstc_system_error(...)` !?
----------
components: Interpreter Core
messages: 387678
nosy: kxrob
priority: normal
severity: normal
status: open
title: PyArg_ParseTuple() false-returns SUCCESS though SystemError and missing
data (when PY_SSIZE_T_CLEAN not #define'd)
type: crash
versions: Python 3.10
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Python tracker <[email protected]>
<https://bugs.python.org/issue43321>
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