drm/amdkfd: fix potential kgd_mem UAFs

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/gpu/drm/amd/amdkfd/kfd_chardev.c"
                    ],
                    "versions": [
                        {
                            "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                            "lessThan": "5045360f3bb62ccd4f87202e33489f71f8bbc3fc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                            "lessThan": "5ca14fb5552ac13a2402d306c0bd2379a71610ff",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "4a488a7ad71401169cecee75dc94bcce642e2c53",
                            "lessThan": "9da050b0d9e04439d225a2ec3044af70cdfb3933",
                            "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/gpu/drm/amd/amdkfd/kfd_chardev.c"
                    ],
                    "versions": [
                        {
                            "version": "3.19",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.19",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.23",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.2.10",
                            "lessThanOrEqual": "6.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }