mm/slub: avoid accessing metadata when pointer is invalid in object_err()

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/slub.c"
                    ],
                    "versions": [
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "872f2c34ff232af1e65ad2df86d61163c8ffad42",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "f66012909e7bf383fcdc5850709ed5716073fdc4",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "7e287256904ee796c9477e3ec92b07f236481ef3",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "1f0797f17927b5cad0fb7eced422f9a7c30a3191",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "0ef7058b4dc6fcef622ac23b45225db57f17b83f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "dda6ec365ab04067adae40ef17015db447e90736",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "3baa1da473e6e50281324ff1d332d1a07a3bb02e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "81819f0fc8285a2a5a921c019e3e3d7b6169d225",
                            "lessThan": "b4efccec8d06ceb10a7d34d7b1c449c569d53770",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "mm/slub.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.22",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.22",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.299",
                            "lessThanOrEqual": "5.4.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.243",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.192",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.151",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.105",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.46",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.16.6",
                            "lessThanOrEqual": "6.16.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.17",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }