s390/pkey: Check length in pkey_pckmo handler implementation

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/s390/crypto/pkey_pckmo.c"
                    ],
                    "versions": [
                        {
                            "version": "8fcc231ce3bea12b78bb94b280cdc03cff342435",
                            "lessThan": "02028a24e26d85262ab9c8fc4344e1f3503007fc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8fcc231ce3bea12b78bb94b280cdc03cff342435",
                            "lessThan": "433e5e70cdc1edf382d28d08a885b22e2b98b7da",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8fcc231ce3bea12b78bb94b280cdc03cff342435",
                            "lessThan": "614aa0491c7a190556c2345dddee0b6f5ed90989",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "8fcc231ce3bea12b78bb94b280cdc03cff342435",
                            "lessThan": "1ac287e2af9a9112fe271427ef45eceb26bce8b4",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/s390/crypto/pkey_pckmo.c"
                    ],
                    "versions": [
                        {
                            "version": "6.12",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.12",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.97",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.40",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.1.5",
                            "lessThanOrEqual": "7.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }