GHSA-8W7W-2RV7-QQW7

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-07-03 18:42
VLAI
Details

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

iommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails

arm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the refcount of the "smmu" even though the return value is less than 0.

The reference counting issue happens in some error handling paths of arm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get() fails, the caller functions forget to decrease the refcount of "smmu" increased by arm_smmu_rpm_get(), causing a refcount leak.

Fix this issue by calling pm_runtime_resume_and_get() instead of pm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount balanced in case of failure.

Severity
7.1 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2021-47327"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-911"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:19Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/arm-smmu: Fix arm_smmu_device refcount leak when arm_smmu_rpm_get fails\n\narm_smmu_rpm_get() invokes pm_runtime_get_sync(), which increases the\nrefcount of the \"smmu\" even though the return value is less than 0.\n\nThe reference counting issue happens in some error handling paths of\narm_smmu_rpm_get() in its caller functions. When arm_smmu_rpm_get()\nfails, the caller functions forget to decrease the refcount of \"smmu\"\nincreased by arm_smmu_rpm_get(), causing a refcount leak.\n\nFix this issue by calling pm_runtime_resume_and_get() instead of\npm_runtime_get_sync() in arm_smmu_rpm_get(), which can keep the refcount\nbalanced in case of failure.",
  "id": "GHSA-8w7w-2rv7-qqw7",
  "modified": "2024-07-03T18:42:48Z",
  "published": "2024-05-21T15:31:43Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47327"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1adf30f198c26539a62d761e45af72cde570413d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3761ae0d0e549f2acdaf11f49df4ed06d256b20f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c4007596fbdabc29f858dc2e1990858a146b60b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbf4daa6f4105e01fbd3868006f65c163365c1e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fe92c058199067ae90cf2a901ddf3c271893557a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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