ksmbd: require 3 sub-authorities before reading sub_auth[2]

{
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                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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                        "fs/smb/server/smbacl.c"
                    ],
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{
                    "product": "Linux",
                    "vendor": "Linux",
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                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/smb/server/smbacl.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15",
                            "status": "affected"
                        },
                        {
                            "version": "0",
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                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.175",
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                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.136",
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                        },
                        {
                            "version": "6.12.83",
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                            "version": "6.18.24",
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                            "version": "7.1",
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                            "versionType": "original_commit_for_fix"
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                }