Buffer overflow in big endian

python · zooba · Feb 12, 2024 · Feb 2, 2024 · Feb 2, 2024 · Feb 2, 2024
commit 7b446485997c3d35db88c1c19bc03714132ee136
diff --git a/Objects/longobject.c b/Objects/longobject.c
@@ -1185,7 +1185,7 @@ PyLong_AsNativeBytes(PyObject* vv, void* buffer, size_t n, int endianness)
            }
            else {
                memset(buffer, fill, n - sizeof(cv.b));
-                memcpy((char *)buffer + n - sizeof(cv.b), cv.b, n);
+                memcpy((char *)buffer + n - sizeof(cv.b), cv.b, sizeof(cv.b));
            }
 #endif
        }