skmsg: Skip zero length skb in sk_msg_recvmsg

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/skmsg.c"
                    ],
                    "versions": [
                        {
                            "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
                            "lessThan": "ddf6f5179638ef0716d32e8fc04a72822b135351",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
                            "lessThan": "195b7bcdfc5adc5b2468f279dd9eb7eebd2e7632",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
                            "lessThan": "fb61d7b9fb6ef0032de469499a54dab4c7260d0d",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
                            "lessThan": "b180739b45a38b4caa88fe16bb5273072e6613dc",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
                            "lessThan": "f8bd689f37f4198a4c61c4684f591ba639595b97",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "604326b41a6fb9b4a78b6179335decee0365cd8c",
                            "lessThan": "f0c18025693707ec344a70b6887f7450bf4c826b",
                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "net/core/skmsg.c"
                    ],
                    "versions": [
                        {
                            "version": "4.20",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "4.20",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.10.273",
                            "lessThanOrEqual": "5.10.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.15.163",
                            "lessThanOrEqual": "5.15.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.1.100",
                            "lessThanOrEqual": "6.1.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.6.41",
                            "lessThanOrEqual": "6.6.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.9.10",
                            "lessThanOrEqual": "6.9.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.10",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }