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bpo-33817: Fix _PyBytes_Resize() for empty bytes object. (GH-11516)

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Add also tests for PyUnicode_FromFormat() and PyBytes_FromFormat()
with empty result.
(cherry picked from commit 44cc4822bb)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
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Miss Islington (bot) 2019-01-11 23:40:09 -08:00 • committed by GitHub
parent 059997d78e
commit d39c192559
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4 changed files with 26 additions and 0 deletions
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13
Objects/bytesobject.c
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@ -2990,9 +2990,22 @@ _PyBytes_Resize(PyObject **pv, Py_ssize_t newsize)
/* return early if newsize equals to v->ob_size */
return 0;
}
if (Py_SIZE(v) == 0) {
if (newsize == 0) {
return 0;
}
*pv = _PyBytes_FromSize(newsize, 0);
Py_DECREF(v);
return (*pv == NULL) ? -1 : 0;
}
if (Py_REFCNT(v) != 1) {
goto error;
}
if (newsize == 0) {
*pv = _PyBytes_FromSize(0, 0);
Py_DECREF(v);
return (*pv == NULL) ? -1 : 0;
}
/* XXX UNREF/NEWREF interface should be more symmetrical */
_Py_DEC_REFTOTAL;
_Py_ForgetReference(v);