danielen <[email protected]> added the comment:
The problem arises from this code in do_mktuple(), staring at line 394 in
modsupport.c:
if (**p_format == '#') {
++*p_format;
if (flags & FLAG_SIZE_T)
n = va_arg(*p_va, Py_ssize_t);
else {
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"PY_SSIZE_T_CLEAN will be required for '#'
formats", 1)) {
return NULL;
}
n = va_arg(*p_va, int);
}
}
If this is entered with an exception raised, PyErr_WarnEx() return NULL, thus
this function return NULL without consuming the argument relative to the string
length for the "s#" specifier. This argument is then consumed at the next
iteration for the "O" specifier, resulting in a segmentation fault when the
string length is interpreted as an object pointer.
I don't know what is the best solution: either ignoring the return value of
PyErr_WarnEx or swapping the lines from
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"PY_SSIZE_T_CLEAN will be required for '#'
formats", 1)) {
return NULL;
}
n = va_arg(*p_va, int);
to
n = va_arg(*p_va, int);
if (PyErr_WarnEx(PyExc_DeprecationWarning,
"PY_SSIZE_T_CLEAN will be required for '#'
formats", 1)) {
return NULL;
}
The handling of the "y#" just below suffers from the same problem.
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<https://bugs.python.org/issue38913>
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