ipv6: prevent possible UaF in addrconf_permanent_addr()

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv6/addrconf.c"
                    ],
                    "versions": [
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "eec49a33611f20336b357b3953df44f1a02049e8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "bacc7f31085c9820922f00bc7d79756ffa13123a",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "7bfafa1b0cd582983ebec6bb20f0a435528fe567",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "7d9f2f4aabd116ca68fbdab5d8fb8dac74c2ea1e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "25357b670afb5b517096da783abaa5cc4bf8359e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "3cd4efb5df72843dfac892d0b3c7a4a8bd926b65",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "2d88ed7fa000e19c2dc0fa31b3a849e3f5bca5c1",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "f1705ec197e705b79ea40fe7a2cc5acfa1d3bfac",
                            "lessThan": "fd63f185979b047fb22a0dfc6bd94d0cab6a6a70",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv6/addrconf.c"
                    ],
                    "versions": [
                        {
                            "version": "4.6",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.6",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.253",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.203",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.168",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.134",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.81",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.22",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19.12",
                            "lessThanOrEqual": "6.19.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }