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Issue #9530: Fix a couple of places where undefined behaviour can

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occur, as a result of signed integer overflow.
This commit is contained in:
Mark Dickinson 2010-08-06 21:33:18 +00:00
parent d0511b0efb
commit 7e3b948cfe
1 changed files with 8 additions and 2 deletions
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10
Objects/bytearrayobject.c
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@ -649,6 +649,11 @@ bytearray_ass_subscript(PyByteArrayObject *self, PyObject *index, PyObject *valu
if (!_canresize(self)) if (!_canresize(self))
return -1; return -1;
if (slicelen == 0)
/* Nothing to do here. */
return 0;
if (step < 0) { if (step < 0) {
stop = start + 1; stop = start + 1;
start = stop + step * (slicelen - 1) - 1; start = stop + step * (slicelen - 1) - 1;
@ -665,7 +670,7 @@ bytearray_ass_subscript(PyByteArrayObject *self, PyObject *index, PyObject *valu
self->ob_bytes + cur + 1, lim); self->ob_bytes + cur + 1, lim);
} }
/* Move the tail of the bytes, in one chunk */ /* Move the tail of the bytes, in one chunk */
cur = start + slicelen*step; cur = start + (size_t)slicelen*step;
if (cur < (size_t)PyByteArray_GET_SIZE(self)) { if (cur < (size_t)PyByteArray_GET_SIZE(self)) {
memmove(self->ob_bytes + cur - slicelen, memmove(self->ob_bytes + cur - slicelen,
self->ob_bytes + cur, self->ob_bytes + cur,
@ -679,7 +684,8 @@ bytearray_ass_subscript(PyByteArrayObject *self, PyObject *index, PyObject *valu
} }
else { else {
/* Assign slice */ /* Assign slice */
Py_ssize_t cur, i; Py_ssize_t i;
size_t cur;
if (needed != slicelen) { if (needed != slicelen) {
PyErr_Format(PyExc_ValueError, PyErr_Format(PyExc_ValueError,