drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()

{
  "id": "4fe5d3f78eb33ea4c975d33a8f36f9e640858de7db36ada00ec228cfc587076a",
  "url": "https://osv.dev/vulnerability/CVE-2022-49309",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: drivers: staging: rtl8723bs: Fix deadlock in rtw_surveydone_event_callback() There is a deadlock in rtw_surveydone_event_callback(), which is shown below: (Thread 1) | (Thread 2) | _set_timer() rtw_surveydone_event_callback()| mod_timer() spin_lock_bh() //(1) | (wait a time) ... | rtw_scan_timeout_handler() del_timer_sync() | spin_lock_bh() //(2) (wait timer to stop) | ... We hold pmlmepriv->lock in position (1) of thread 1 and use del_timer_sync() to wait timer to stop, but timer handler also need pmlmepriv->lock in position (2) of thread 2. As a result, rtw_surveydone_event_callback() will block forever. This patch extracts del_timer_sync() from the protection of spin_lock_bh(), which could let timer handler to obtain the needed lock. What`s more, we change spin_lock_bh() in rtw_scan_timeout_handler() to spin_lock_irq(). Otherwise, spin_lock_bh() will also cause deadlock() in timer handler.",
    "evidence": "osv:CVE-2022-49309",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.237",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.17.15",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.18.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2022-49309",
      "aliases": [
        "CVE-2022-49309"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "fb127a61c9d8dfd9b370ee173344d01711f3c698"
                },
                {
                  "fixed": "c84e5c819600ee0628f61b33d145258ae0f3d7a7"
                },
                {
                  "fixed": "f89f6c3ebf69623b8ea48200bd690e9e210335a1"
                },
                {
                  "fixed": "ce129d3efd181da5fd56f4360cc8827122afa67e"
                },
                {
                  "fixed": "2c41f5c341853f84b7bc2f32605d4e2782e8c279"
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                {
                  "fixed": "cc7ad0d77b51c872d629bcd98aea463a3c4109e7"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49309.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.10.0"
                },
                {
                  "fixed": "5.10.237"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
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                {
                  "fixed": "5.15.47"
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            {
              "type": "ECOSYSTEM",
              "events": [
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                  "introduced": "5.16.0"
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                  "fixed": "5.17.15"
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.18.0"
                },
                {
                  "fixed": "5.18.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2022-49309.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:33.089483773Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2c41f5c341853f84b7bc2f32605d4e2782e8c279",
        "https://git.kernel.org/stable/c/c84e5c819600ee0628f61b33d145258ae0f3d7a7",
        "https://git.kernel.org/stable/c/cc7ad0d77b51c872d629bcd98aea463a3c4109e7",
        "https://git.kernel.org/stable/c/ce129d3efd181da5fd56f4360cc8827122afa67e",
        "https://git.kernel.org/stable/c/f89f6c3ebf69623b8ea48200bd690e9e210335a1",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49309.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49309",
        "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/2022/49xxx/CVE-2022-49309.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2022-49309",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 499833,
  "published_at": "2025-02-26T02:10:40.167+00:00"
}