bpo-35436: Add missing PyErr_NoMemory() calls and other minor bug fixes. (GH-11015)

Set MemoryError when appropriate, add missing failure checks,
and fix some potential leaks.

1 files changed, 4 insertions, 0 deletions

diff --git a/Modules/_abc.c b/Modules/_abc.c
index 9de199f..36c1757 100644
--- a/Modules/_abc.c
+++ b/Modules/_abc.c
@@ -728,6 +728,10 @@ subclasscheck_check_registry(_abc_data *impl, PyObject *subclass,
     // Weakref callback may remove entry from set.
     // So we take snapshot of registry first.
     PyObject **copy = PyMem_Malloc(sizeof(PyObject*) * registry_size);
+    if (copy == NULL) {
+        PyErr_NoMemory();
+        return -1;
+    }
     PyObject *key;
     Py_ssize_t pos = 0;
     Py_hash_t hash;