tract-nnef: integer overflow in NNEF `.dat` tensor parser yields an out-of-bounds read on model load

{
                    "vendor": "sonos",
                    "product": "tract",
                    "versions": [
                        {
                            "version": "< 0.21.16",
                            "status": "affected"
                        },
                        {
                            "version": ">= 0.22.0, < 0.22.2",
                            "status": "affected"
                        },
                        {
                            "version": ">= 0.23.0, < 0.23.1",
                            "status": "affected"
                        }
                    ]
                }