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........
  r76629 | mark.dickinson | 2009-12-02 17:33:41 +0000 (Wed, 02 Dec 2009) | 3 lines

  Issue #7406:  Fix some occurrences of potential signed overflow in int
  arithmetic.
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This commit is contained in:
Mark Dickinson 2009-12-02 17:36:34 +00:00
parent 0d124c29e2
commit 6df863c93a
2 changed files with 12 additions and 5 deletions
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8
Python/ceval.c
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@ -1191,7 +1191,9 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
register long a, b, i;
a = PyInt_AS_LONG(v);
b = PyInt_AS_LONG(w);
i = a + b;
/* cast to avoid undefined behaviour
on overflow */
i = (long)((unsigned long)a + b);
if ((i^a) < 0 && (i^b) < 0)
goto slow_add;
x = PyInt_FromLong(i);
@ -1221,7 +1223,9 @@ PyEval_EvalFrameEx(PyFrameObject *f, int throwflag)
register long a, b, i;
a = PyInt_AS_LONG(v);
b = PyInt_AS_LONG(w);
i = a - b;
/* cast to avoid undefined behaviour
on overflow */
i = (long)((unsigned long)a - b);
if ((i^a) < 0 && (i^~b) < 0)
goto slow_sub;
x = PyInt_FromLong(i);