Martin Panter added the comment:
Not particularly related, but the special fast case in
Objects/listobject.c:811, listextend(), also seems to lack an overflow check.
“An alternative would be to raise the error without trying to allocate
Py_SSIZE_T_MAX first”: what I meant was removing the special case to allocate
PY_SSIZE_T_MAX. As soon as it attempts to overallocate 2+ GiB of memory it
fails. Something more like
addition = len >> 1;
if (addition > PY_SSIZE_T_MAX - len - 1) {
/* . . . */
return PyErr_NoMemory();
}
buf_size = len + addition;
Antti: in this case we are allocating an array of _bytes_, not pointers. So
maybe it is possible to reach the limit with a 32-bit address space.
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<http://bugs.python.org/issue27507>
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