macvlan: fix possible UAF in macvlan_forward_source()

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/net/macvlan.c"
                    ],
                    "versions": [
                        {
                            "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
                            "lessThan": "8133e85b8a3ec9f10d861e0002ec6037256e987e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
                            "lessThan": "484919832e2db6ce1e8add92c469e5d459a516b5",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
                            "lessThan": "232afc74a6dde0fe1830988e5827921f5ec9bb3f",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
                            "lessThan": "15f6faf36e162532bec5cc05eb3fc622108bf2ed",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
                            "lessThan": "8518712a2ca952d6da2238c6f0a16b4ae5ea3f13",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
                            "lessThan": "6dbead9c7677186f22b7981dd085a0feec1f038e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "79cf79abce71eb7dbc40e2f3121048ca5405cb47",
                            "lessThan": "7470a7a63dc162f07c26dbf960e41ee1e248d80e",
                            "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/net/macvlan.c"
                    ],
                    "versions": [
                        {
                            "version": "3.18",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "3.18",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.249",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.199",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.162",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.122",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.67",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.7",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.19",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }