[3.9] bpo-45581: Raise MemoryError in sqlite3.connect if SQLite signals memory error (GH-29171) (GH-29324)

(cherry picked from commit e2e62b3)

Co-authored-by: Erlend Egeberg Aasland <[email protected]>

Author: ambv

Misc/NEWS.d/next/Library/2021-10-22-21-57-02.bpo-45581.rlH6ay.rst

@@ -0,0 +1,2 @@
+:meth:`sqlite3.connect` now correctly raises :exc:`MemoryError` if the
+underlying SQLite API signals memory error. Patch by Erlend E. Aasland.

Modules/_sqlite/connection.c

@@ -134,6 +134,10 @@ int pysqlite_connection_init(pysqlite_Connection* self, PyObject* args, PyObject
 
     Py_DECREF(database_obj);
 
+    if (self->db == NULL && rc == SQLITE_NOMEM) {
+        PyErr_NoMemory();
+        return -1;
+    }
     if (rc != SQLITE_OK) {
         _pysqlite_seterror(self->db, NULL);
         return -1;