bpf: Reject variable offset alu on PTR_TO_FLOW_KEYS

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/verifier.c"
                    ],
                    "versions": [
                        {
                            "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
                            "lessThan": "29ffa63f21bcdcef3e36b03cccf9d0cd031f6ab0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
                            "lessThan": "4108b86e324da42f7ed425bd71632fd844300dc8",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
                            "lessThan": "e8d3872b617c21100c5ee4f64e513997a68c2e3d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
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                        },
                        {
                            "version": "d58e468b1112dcd1d5193c0a89ff9f98b5a3e8b9",
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                            "status": "affected",
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                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "kernel/bpf/verifier.c"
                    ],
                    "versions": [
                        {
                            "version": "4.20",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.20",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.148",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.75",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.14",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.7.2",
                            "lessThanOrEqual": "6.7.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.8",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }