ubi: Fix possible null-ptr-deref in ubi_free_volume()

{
  "id": "969073dd9afdecadb08a3d32a4a17b94155aca60b74d158c60da622ced9aebd4",
  "url": "https://osv.dev/vulnerability/CVE-2023-54087",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ubi: Fix possible null-ptr-deref in ubi_free_volume()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ubi: Fix possible null-ptr-deref in ubi_free_volume() It willl cause null-ptr-deref in the following case: uif_init() ubi_add_volume() cdev_add() -> if it fails, call kill_volumes() device_register() kill_volumes() -> if ubi_add_volume() fails call this function ubi_free_volume() cdev_del() device_unregister() -> trying to delete a not added device, it causes null-ptr-deref So in ubi_free_volume(), it delete devices whether they are added or not, it will causes null-ptr-deref. Handle the error case whlie calling ubi_add_volume() to fix this problem. If add volume fails, set the corresponding vol to null, so it can not be accessed in kill_volumes() and release the resource in ubi_add_volume() error path.",
    "evidence": "osv:CVE-2023-54087",
    "products": [
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          "evidence": "/affected/1/package/name"
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        "prerequisites": [],
        "fixed_versions": [
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    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-54087",
      "aliases": [
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      "modified": "2026-10-28T02:30:35.866429054Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/234c53e57424992e657e6f4acc00d3df0983176f",
        "https://git.kernel.org/stable/c/2ea7195b195009ecf0046e55361f393ba96d02db",
        "https://git.kernel.org/stable/c/45b2c5ca4d2edae70f19fdb086bd927840c4c309",
        "https://git.kernel.org/stable/c/5558bcf1c58720ca6e9d6198d921cb3aa337f038",
        "https://git.kernel.org/stable/c/5ec4c8aca5a221756a9007deadfea92795319fee",
        "https://git.kernel.org/stable/c/9eccdb0760cbcb4427b5303a83a3007de998af51",
        "https://git.kernel.org/stable/c/c15859bfd326c10230f09cb48a17f8a35f190342",
        "https://git.kernel.org/stable/c/fcbc795abe7897da4b5d2a6ab5010e36774b00c2",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54087.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54087",
        "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/2023/54xxx/CVE-2023-54087.json"
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    "related_cves": [
      {
        "value": "CVE-2023-54087",
        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 503441,
  "published_at": "2025-12-24T13:06:17.555+00:00"
}