netfilter: conntrack_irc: fix possible out-of-bounds read

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/netfilter/nf_conntrack_irc.c"
                    ],
                    "versions": [
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "4cdda7f868f48e2f81579371584fdbdce37df2c8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "8a1d6e40dedfe1068aee094d851bd69e289c9fd6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "0afc802160af0df61ed374fdb97fb34cfe5cdf2f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "7c34f91305292083253df6a9f6c8ede02d4ccaea",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "ddddd8271359961e403d11c90c9ba9fc38914f7e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "9e5da2379f968a3ea5a6e38921ab6201576466dc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "573810f61bcd6b6815e2ff53bbdd2b9c9d747176",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "869f37d8e48f3911eb70f38a994feaa8f8380008",
                            "lessThan": "66eba0ffce3b7e11449946b4cbbef8ea36112f56",
                            "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/netfilter/nf_conntrack_irc.c"
                    ],
                    "versions": [
                        {
                            "version": "2.6.20",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "2.6.20",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.259",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.210",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.176",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.143",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.94",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.36",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.0.13",
                            "lessThanOrEqual": "7.0.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }