diff options
Diffstat (limited to 'Modules/arraymodule.c')
| -rw-r--r-- | Modules/arraymodule.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c index 1dbe9181af..8f6ca3925d 100644 --- a/Modules/arraymodule.c +++ b/Modules/arraymodule.c @@ -1699,6 +1699,16 @@ array_ass_subscr(arrayobject* self, PyObject* item, PyObject* value) if ((step > 0 && stop < start) || (step < 0 && stop > start)) stop = start; + + /* 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 ((needed == 0 || slicelength != needed) && self->ob_exports > 0) { + PyErr_SetString(PyExc_BufferError, + "cannot resize an array that is exporting buffers"); + return -1; + } + if (step == 1) { if (slicelength > needed) { memmove(self->ob_item + (start + needed) * itemsize, |