ipv6: fix possible UAF in ip6_finish_output2()

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv6/ip6_output.c"
                    ],
                    "versions": [
                        {
                            "version": "ded37d03440d0ab346a8287cc2ba88b8dc90ceb0",
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                        {
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                            "lessThan": "da273b377ae0d9bd255281ed3c2adb228321687b",
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                            "versionType": "git"
                        },
                        {
                            "version": "b34c668a867ffdcf8bd8db4a36512572e82b4a15",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.4.137",
                            "lessThan": "5.4.289",
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                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.55",
                            "lessThan": "5.10.233",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.13.7",
                            "lessThan": "5.14",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/ipv6/ip6_output.c"
                    ],
                    "versions": [
                        {
                            "version": "5.14",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.14",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.4.289",
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                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.233",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.166",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.107",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.48",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.10.7",
                            "lessThanOrEqual": "6.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.11",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }