ghsa-q34q-mrch-vm2x
Vulnerability from github
Published
2024-04-10 21:30
Modified
2024-11-17 15:30
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Details

In the Linux kernel, the following vulnerability has been resolved:

spi: fix use-after-free of the add_lock mutex

Commit 6098475d4cb4 ("spi: Fix deadlock when adding SPI controllers on SPI buses") introduced a per-controller mutex. But mutex_unlock() of said lock is called after the controller is already freed:

spi_unregister_controller(ctlr) -> put_device(&ctlr->dev) -> spi_controller_release(dev) -> mutex_unlock(&ctrl->add_lock)

Move the put_device() after the mutex_unlock().

Show details on source website

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47195"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-04-10T19:15:47Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: fix use-after-free of the add_lock mutex\n\nCommit 6098475d4cb4 (\"spi: Fix deadlock when adding SPI controllers on\nSPI buses\") introduced a per-controller mutex. But mutex_unlock() of\nsaid lock is called after the controller is already freed:\n\n  spi_unregister_controller(ctlr)\n  -\u003e put_device(\u0026ctlr-\u003edev)\n    -\u003e spi_controller_release(dev)\n  -\u003e mutex_unlock(\u0026ctrl-\u003eadd_lock)\n\nMove the put_device() after the mutex_unlock().",
  "id": "GHSA-q34q-mrch-vm2x",
  "modified": "2024-11-17T15:30:44Z",
  "published": "2024-04-10T21:30:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47195"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/11eab327a2a8bd36c38afbff920ae1bd45588dd4"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37330f37f6666c7739a44b2b6b95b047ccdbed2d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54c2c96eafcfd242e52e932ab54ace4784efe1dd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6c53b45c71b4920b5e62f0ea8079a1da382b9434"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}


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