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Issue #1621: Overflow should not be possible in listextend()

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Martin Panter 2017-01-14 06:30:37 +00:00
parent 5644729aa6
commit 94b39ceb73
1 changed files with 3 additions and 0 deletions
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3
Objects/listobject.c
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@ -804,6 +804,9 @@ listextend(PyListObject *self, PyObject *b)
Py_RETURN_NONE; Py_RETURN_NONE;
} }
m = Py_SIZE(self); m = Py_SIZE(self);
/* It should not be possible to allocate a list large enough to cause
an overflow on any relevant platform */
assert(m < PY_SSIZE_T_MAX - n);
if (list_resize(self, m + n) < 0) { if (list_resize(self, m + n) < 0) {
Py_DECREF(b); Py_DECREF(b);
return NULL; return NULL;