bpf: Defer the free of inner map when necessary

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/bpf.h",
                        "kernel/bpf/map_in_map.c",
                        "kernel/bpf/syscall.c"
                    ],
                    "versions": [
                        {
                            "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
                            "lessThan": "90c445799fd1dc214d7c6279c144e33a35e29ef2",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
                            "lessThan": "37d98fb9c3144c0fddf7f6e99aece9927ac8dce6",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
                            "lessThan": "62fca83303d608ad4fec3f7428c8685680bb01b0",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
                            "lessThan": "f91cd728b10c51f6d4a39957ccd56d1e802fc8ee",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
                            "lessThan": "bfd9b20c4862f41d4590fde11d70a5eeae53dcc5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7",
                            "lessThan": "876673364161da50eed6b472d746ef88242b2368",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "include/linux/bpf.h",
                        "kernel/bpf/map_in_map.c",
                        "kernel/bpf/syscall.c"
                    ],
                    "versions": [
                        {
                            "version": "5.9",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "5.9",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.214",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.153",
                            "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"
                        }
                    ]
                }