New submission from STINNER Victor:
On Windows x64, we get the following warning:
..\Objects\codeobject.c(106): warning C4244: '=' : conversion from 'Py_ssize_t'
to 'unsigned char', possible loss of data
[C:\buildbot.python.org\3.x.kloth-win64\build\PCbuild\pythoncore.vcxproj]
Code:
unsigned char *cell2arg = NULL;
Py_ssize_t total_args = argcount + kwonlyargcount +
((flags & CO_VARARGS) != 0) + ((flags & CO_VARKEYWORDS) != 0);
PyObject *cell = PyTuple_GET_ITEM(cellvars, i);
for (j = 0; j < total_args; j++) {
PyObject *arg = PyTuple_GET_ITEM(varnames, j);
if (!PyUnicode_Compare(cell, arg)) {
====> cell2arg[i] = j; <===== HERE
used_cell2arg = 1;
break;
}
}
total_args is not checked for being smaller than 256.
Related issue: #9566.
----------
components: Interpreter Core
messages: 191805
nosy: haypo
priority: normal
severity: normal
status: open
title: Possible integer overflow in PyCode_New()
versions: Python 3.4
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<http://bugs.python.org/issue18295>
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