class: fix possible memory leak in __class_register()

{
  "id": "3274a612a3f5e03dd65f981709dd3d56a36b1a9df103ef0d60f99313e6869688",
  "url": "https://osv.dev/vulnerability/CVE-2022-50578",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "class: fix possible memory leak in __class_register()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: class: fix possible memory leak in __class_register() If class_add_groups() returns error, the 'cp->subsys' need be unregister, and the 'cp' need be freed. We can not call kset_unregister() here, because the 'cls' will be freed in callback function class_release() and it's also freed in caller's error path, it will cause double free. So fix this by calling kobject_del() and kfree_const(name) to cleanup kobject. Besides, call kfree() to free the 'cp'. Fault injection test can trigger this: unreferenced object 0xffff888102fa8190 (size 8): comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s) hex dump (first 8 bytes): 70 6b 74 63 64 76 64 00 pktcdvd. backtrace: [<00000000e7c7703d>] __kmalloc_track_caller+0x1ae/0x320 [<000000005e4d70bc>] kstrdup+0x3a/0x70 [<00000000c2e5e85a>] kstrdup_const+0x68/0x80 [<000000000049a8c7>] kvasprintf_const+0x10b/0x190 [<0000000029123163>] kobject_set_name_vargs+0x56/0x150 [<00000000747219c9>] kobject_set_name+0xab/0xe0 [<0000000005f1ea4e>] __class_register+0x15c/0x49a unreferenced object 0xffff888037274000 (size 1024): comm \"modprobe\", pid 502, jiffies 4294906074 (age 49.296s) hex dump (first 32 bytes): 00 40 27 37 80 88 ff ff 00 40 27 37 80 88 ff ff .@'7.....@'7.... 00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00 .....N.......... backtrace: [<00000000151f9600>] kmem_cache_alloc_trace+0x17c/0x2f0 [<00000000ecf3dd95>] __class_register+0x86/0x49a",
    "evidence": "osv:CVE-2022-50578",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "4.14.303",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "4.19.270",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.4.229",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.10.163",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.86",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.0.16",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.2",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-50578",
      "aliases": [
        "CVE-2022-50578"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "ced6473e7486702f530a49f886b73195e4977734"
                },
                {
                  "fixed": "4efa5443817c1b6de22d401aeca5b2481e835f8c"
                },
                {
                  "fixed": "3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd"
                },
                {
                  "fixed": "3e0efc3f3f5e5c73996782f8db69963e501bb878"
                },
                {
                  "fixed": "18a7200646958cf8e1b8a933de08122fc50676cd"
                },
                {
                  "fixed": "417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7"
                },
                {
                  "fixed": "e764ad5918a099ebeb909ccff83893a714e497e1"
                },
                {
                  "fixed": "abaedb68a769e6bf36836b55a2f49b531c5f3f7b"
                },
                {
                  "fixed": "8c3e8a6bdb5253b97ad532570f8b5db5f7a06407"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50578.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.10.0"
                },
                {
                  "fixed": "4.14.303"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.15.0"
                },
                {
                  "fixed": "4.19.270"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.20.0"
                },
                {
                  "fixed": "5.4.229"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.5.0"
                },
                {
                  "fixed": "5.10.163"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
                },
                {
                  "fixed": "5.15.86"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.0.16"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.1.0"
                },
                {
                  "fixed": "6.1.2"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-50578.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:30.376983222Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/18a7200646958cf8e1b8a933de08122fc50676cd",
        "https://git.kernel.org/stable/c/3bb9c92c27624ad076419a70f2b1a30cd1f8bbbd",
        "https://git.kernel.org/stable/c/3e0efc3f3f5e5c73996782f8db69963e501bb878",
        "https://git.kernel.org/stable/c/417ef049e3fd3b0d2593c1d5ffa3d0d5d0a018a7",
        "https://git.kernel.org/stable/c/4efa5443817c1b6de22d401aeca5b2481e835f8c",
        "https://git.kernel.org/stable/c/8c3e8a6bdb5253b97ad532570f8b5db5f7a06407",
        "https://git.kernel.org/stable/c/abaedb68a769e6bf36836b55a2f49b531c5f3f7b",
        "https://git.kernel.org/stable/c/e764ad5918a099ebeb909ccff83893a714e497e1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50578.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-50578",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/50xxx/CVE-2022-50578.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-50578",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497358,
  "published_at": "2025-10-22T13:23:31.565+00:00"
}