diff options
Diffstat (limited to 'Modules/arraymodule.c')
| -rw-r--r-- | Modules/arraymodule.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c index 6dc46ad..256bcd8 100644 --- a/Modules/arraymodule.c +++ b/Modules/arraymodule.c @@ -735,6 +735,14 @@ array_ass_slice(arrayobject *a, Py_ssize_t ilow, Py_ssize_t ihigh, PyObject *v) ihigh = Py_SIZE(a); item = a->ob_item; d = n - (ihigh-ilow); + /* Issue #4509: If the array has exported buffers and the slice + assignment would change the size of the array, fail early to make + sure we don't modify it. */ + if (d != 0 && a->ob_exports > 0) { + PyErr_SetString(PyExc_BufferError, + "cannot resize an array that is exporting buffers"); + return -1; + } if (d < 0) { /* Delete -d items */ memmove(item + (ihigh+d)*a->ob_descr->itemsize, item + ihigh*a->ob_descr->itemsize, |