Marc-Andre Lemburg added the comment:
The patch looks fine to me, but I still wonder how p - PyBytes_AS_STRING(v) can
be negative when size == 0...
Ah, now I get it: the new size is 0, but the refcount is not 1, since the
nullstring is shared. This causes the exception.
>From _PyBytes_Resize():
if (!PyBytes_Check(v) || Py_REFCNT(v) != 1 || newsize < 0) {
*pv = 0;
Py_DECREF(v);
PyErr_BadInternalCall();
return -1;
}
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<http://bugs.python.org/issue25270>
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