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Issue #1621: Fix undefined behaviour from signed overflow in datetime module hashes, array and list iterations, and get_integer (stringlib/string_format.h)

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This commit is contained in:
Mark Dickinson 2011-09-25 15:34:32 +01:00
parent 50203a69b3
commit c7d93b7614
4 changed files with 14 additions and 16 deletions
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6
Objects/listobject.c
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@ -2434,7 +2434,7 @@ list_subscript(PyListObject* self, PyObject* item)
src = self->ob_item;
dest = ((PyListObject *)result)->ob_item;
for (cur = start, i = 0; i < slicelength;
cur += step, i++) {
cur += (size_t)step, i++) {
it = src[cur];
Py_INCREF(it);
dest[i] = it;
@ -2525,7 +2525,7 @@ list_ass_subscript(PyListObject* self, PyObject* item, PyObject* value)
self->ob_item + cur + 1,
lim * sizeof(PyObject *));
}
cur = start + slicelength*step;
cur = start + (size_t)slicelength * step;
if (cur < (size_t)Py_SIZE(self)) {
memmove(self->ob_item + cur - slicelength,
self->ob_item + cur,
@ -2589,7 +2589,7 @@ list_ass_subscript(PyListObject* self, PyObject* item, PyObject* value)
selfitems = self->ob_item;
seqitems = PySequence_Fast_ITEMS(seq);
for (cur = start, i = 0; i < slicelength;
cur += step, i++) {
cur += (size_t)step, i++) {
garbage[i] = selfitems[cur];
ins = seqitems[i];
Py_INCREF(ins);