ceph: bound xattr value length in __build_xattrs()

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ceph/xattr.c"
                    ],
                    "versions": [
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "848b80ca6b410f350d08b8ac19a00ef88223f2ea",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "01e3f19c301d492e12f16b3b463ac14d7cf3ebe7",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "cb0cd79ae80476d1bc06bd9678484b6736f19588",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "61f085cb8976c9cebc90e1a8933e4cc1ad8b0fce",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "38be2f3c41ecaba58bb92dc16603e09ba9fd64f1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "1dd356310b1660215f9a3626580bf8b363ef981e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "b12b3320c81fd72ab36388fb2445fec9c3038f10",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "355da1eb7a1f91c276b991764e951bbcd8047599",
                            "lessThan": "68d541754d6cd3bb98d1fd8314f57e5eb533557d",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ceph/xattr.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.34",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.34",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.270",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.221",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.188",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.157",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.109",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.50",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.4",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }