ghsa-fw4j-88v3-6hfw
Vulnerability from github
Published
2024-05-21 15:31
Modified
2025-05-12 21:30
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:

dma-buf/sync_file: Don't leak fences on merge failure

Each add_fence() call does a dma_fence_get() on the relevant fence. In the error path, we weren't calling dma_fence_put() so all those fences got leaked. Also, in the krealloc_array failure case, we weren't freeing the fences array. Instead, ensure that i and fences are always zero-initialized and dma_fence_put() all the fences and kfree(fences) on every error path.

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47305"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-617"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:18Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndma-buf/sync_file: Don\u0027t leak fences on merge failure\n\nEach add_fence() call does a dma_fence_get() on the relevant fence.  In\nthe error path, we weren\u0027t calling dma_fence_put() so all those fences\ngot leaked.  Also, in the krealloc_array failure case, we weren\u0027t\nfreeing the fences array.  Instead, ensure that i and fences are always\nzero-initialized and dma_fence_put() all the fences and kfree(fences) on\nevery error path.",
  "id": "GHSA-fw4j-88v3-6hfw",
  "modified": "2025-05-12T21:30:55Z",
  "published": "2024-05-21T15:31:42Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47305"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705ce"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435"
    }
  ],
  "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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