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Issue #27214: Fix potential bug and remove useless optimization in long_invert. Thanks Oren Milman.

This commit is contained in:
Mark Dickinson 2016-08-29 16:40:29 +01:00
parent 2be278c70c
commit 583c6e860c
2 changed files with 8 additions and 2 deletions
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4
Misc/NEWS
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@ -10,6 +10,10 @@ What's New in Python 3.6.0 beta 1
Core and Builtins Core and Builtins
----------------- -----------------
- Issue #27214: In long_invert, be more careful about modifying object
returned by long_add, and remove an unnecessary check for small longs.
Thanks Oren Milman for analysis and patch.
- Issue #27506: Support passing the bytes/bytearray.translate() "delete" - Issue #27506: Support passing the bytes/bytearray.translate() "delete"
argument by keyword. argument by keyword.

6
Objects/longobject.c
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@ -4170,8 +4170,10 @@ long_invert(PyLongObject *v)
Py_DECREF(w); Py_DECREF(w);
if (x == NULL) if (x == NULL)
return NULL; return NULL;
Py_SIZE(x) = -(Py_SIZE(x)); _PyLong_Negate(&x);
return (PyObject *)maybe_small_long(x); /* No need for maybe_small_long here, since any small
longs will have been caught in the Py_SIZE <= 1 fast path. */
return (PyObject *)x;
} }
static PyObject * static PyObject *