gh-153205: Set MemoryError in stackref array conversion (#153206)

aisk · blurb-it[bot] · sobolevn · web-flow · commit 08759ff10155 · 2026-07-07T16:03:34.000Z
Co-authored-by: blurb-it[bot] &lt;43283697+blurb-it[bot]@users.noreply.github.com&gt;
Co-authored-by: sobolevn &lt;mail@sobolevn.me&gt;
diff --git a/Misc/NEWS.d/next/Core_and_Builtins/2026-07-07-04-16-48.gh-issue-153205.5fE8QZ.rst b/Misc/NEWS.d/next/Core_and_Builtins/2026-07-07-04-16-48.gh-issue-153205.5fE8QZ.rst
@@ -0,0 +1,2 @@
+Fix a potential :exc:`SystemError` during vector calls when memory allocation fails.
+A :exc:`MemoryError` is now raised instead.
diff --git a/Python/ceval.c b/Python/ceval.c
@@ -1056,6 +1056,7 @@ _PyObjectArray_FromStackRefArray(_PyStackRef *input, Py_ssize_t nargs, PyObject
         // +1 in case PY_VECTORCALL_ARGUMENTS_OFFSET is set.
         result = PyMem_Malloc((nargs + 1) * sizeof(PyObject *));
         if (result == NULL) {
+            PyErr_NoMemory();
             return NULL;
         }
     }

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Fix a potential :exc:`SystemError` during vector calls when memory allocation fails.
	`2`	+A :exc:`MemoryError` is now raised instead.
Original file line number	Diff line number	Diff line change
`@@ -1056,6 +1056,7 @@ _PyObjectArray_FromStackRefArray(_PyStackRef *input, Py_ssize_t nargs, PyObject`
`1056`	`1056`	`// +1 in case PY_VECTORCALL_ARGUMENTS_OFFSET is set.`
`1057`	`1057`	`result = PyMem_Malloc((nargs + 1) * sizeof(PyObject *));`
`1058`	`1058`	`if (result == NULL) {`
	`1059`	`+ PyErr_NoMemory();`
`1059`	`1060`	`return NULL;`
`1060`	`1061`	`}`
`1061`	`1062`	`}`