ceph: lock mutex in ceph_mds_check_access()

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ceph/mds_client.c",
                        "fs/ceph/mds_client.h"
                    ],
                    "versions": [
                        {
                            "version": "596afb0b8933ba6ed7227adcc538db26feb25c74",
                            "lessThan": "729c1ff670ece6f3d4b1738365a0b2f90d487523",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "596afb0b8933ba6ed7227adcc538db26feb25c74",
                            "lessThan": "ca5bfea2045ef2eb3305cf2a9d8da549b76c37d3",
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                        {
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                        {
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                            "status": "affected",
                            "versionType": "git"
                        }
                    ]
                }

{
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "affected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "fs/ceph/mds_client.c",
                        "fs/ceph/mds_client.h"
                    ],
                    "versions": [
                        {
                            "version": "6.10",
                            "status": "affected"
                        },
                        {
                            "version": "0",
                            "lessThan": "6.10",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.12.110",
                            "lessThanOrEqual": "6.12.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "6.18.51",
                            "lessThanOrEqual": "6.18.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.2.5",
                            "lessThanOrEqual": "7.2.*",
                            "status": "unaffected",
                            "versionType": "semver"
                        },
                        {
                            "version": "7.3",
                            "lessThanOrEqual": "*",
                            "status": "unaffected",
                            "versionType": "original_commit_for_fix"
                        }
                    ]
                }