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Backport issue #12973 list_repeat fix from 3.x.

This commit is contained in:
Mark Dickinson 2011-09-19 19:23:55 +01:00
parent dbbed04941
commit 4ac5d2cda4
2 changed files with 6 additions and 4 deletions
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4
Misc/NEWS
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@ -12,7 +12,9 @@ Core and Builtins
- Issue #12973: Fix overflow checks that invoked undefined behaviour in
int.__pow__. These overflow checks were causing int.__pow__ to produce
incorrect results with recent versions of Clang, as a result of the
compiler optimizing the check away.
compiler optimizing the check away. Also fix similar overflow check
in list_repeat (which caused test_list to fail with recent versions
of Clang).
- Issue #12266: Fix str.capitalize() to correctly uppercase/lowercase
titlecased and cased non-letter characters.

6
Objects/listobject.c
View File

@ -58,7 +58,7 @@ list_resize(PyListObject *self, Py_ssize_t newsize)
if (newsize == 0)
new_allocated = 0;
items = self->ob_item;
if (new_allocated <= ((~(size_t)0) / sizeof(PyObject *)))
if (new_allocated <= (PY_SIZE_MAX / sizeof(PyObject *)))
PyMem_RESIZE(items, PyObject *, new_allocated);
else
items = NULL;
@ -551,9 +551,9 @@ list_repeat(PyListObject *a, Py_ssize_t n)
PyObject *elem;
if (n < 0)
n = 0;
size = Py_SIZE(a) * n;
if (n && size/n != Py_SIZE(a))
if (n > 0 && Py_SIZE(a) > PY_SSIZE_T_MAX / n)
return PyErr_NoMemory();
size = Py_SIZE(a) * n;
if (size == 0)
return PyList_New(0);
np = (PyListObject *) PyList_New(size);