fkie_cve-2021-47305
Vulnerability from fkie_nvd
Published
2024-05-21 15:15
Modified
2025-05-12 20:00
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705cePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/0d514185ae792d3a1903c8e1a83899aa996705cePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/19edcd97727aae9362444a859a24d99a8730cb27Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/19f51c2529339280d2c8c6427cd3e21ddf1ac3f8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/41f45e91c92c8480242ea448d54e28c753b13902Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e0355a0ad31a1d677b2a4514206de4902bd550e8Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/ffe000217c5068c5da07ccb1c0f8cce7ad767435Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.14


To clipboard 

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: dma-buf/sync_file: no filtrar barreras en caso de falla de fusi\u00f3n. Cada llamada a add_fence() realiza un dma_fence_get() en la barrera relevante. En la ruta del error, no est\u00e1bamos llamando a dma_fence_put() por lo que se filtraron todas esas barreras. Adem\u00e1s, en el caso de falla de krealloc_array, no est\u00e1bamos liberando la matriz de vallas. En su lugar, aseg\u00farese de que i y las vallas est\u00e9n siempre inicializadas en cero y dma_fence_put() todas las vallas y kfree(fences) en cada ruta de error."
    }
  ],
  "id": "CVE-2021-47305",
  "lastModified": "2025-05-12T20:00:28.990",
  "metrics": {
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        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
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  "published": "2024-05-21T15:15:18.177",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-617"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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