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bpo-31619: Fixed a ValueError when convert a string with large number of underscores (#3827)

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to integer with binary base.
This commit is contained in:
Serhiy Storchaka 2017-10-03 14:13:44 +03:00 • committed by GitHub
parent 1a87de7fcf
commit 85c0b8941f
3 changed files with 14 additions and 4 deletions
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8
Objects/longobject.c
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@ -2057,15 +2057,15 @@ long_from_binary_base(const char **str, int base, PyLongObject **res)
}
*str = p;
/* n <- # of Python digits needed, = ceiling(n/PyLong_SHIFT). */
n = digits * bits_per_char + PyLong_SHIFT - 1;
if (n / bits_per_char < p - start) {
/* n <- the number of Python digits needed,
= ceiling((digits * bits_per_char) / PyLong_SHIFT). */
if (digits > (PY_SSIZE_T_MAX - (PyLong_SHIFT - 1)) / bits_per_char) {
PyErr_SetString(PyExc_ValueError,
"int string too large to convert");
*res = NULL;
return 0;
}
n = n / PyLong_SHIFT;
n = (digits * bits_per_char + PyLong_SHIFT - 1) / PyLong_SHIFT;
z = _PyLong_New(n);
if (z == NULL) {
*res = NULL;