accel/rocket: fix NULL dereference and integer overflow in rocket_job_push()

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/accel/rocket/rocket_job.c"
                    ],
                    "versions": [
                        {
                            "version": "0810d5ad88a18f1e6d549853a388ad0316f74e36",
                            "lessThan": "c1a5bf1b6e1d5944183dcef3844a18c17219af4d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0810d5ad88a18f1e6d549853a388ad0316f74e36",
                            "lessThan": "dfff90a6eb2258e3b867994ae17af4a7ba3504d2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "0810d5ad88a18f1e6d549853a388ad0316f74e36",
                            "lessThan": "a85402bff218f2b8f0d806e46c16c2f3d49cdda7",
                            "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/accel/rocket/rocket_job.c"
                    ],
                    "versions": [
                        {
                            "version": "6.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.50",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.4",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }