erofs: Fix detection of atomic context

{
  "id": "ab38e2e4ee51a1e203acff3ad51b12c70b3a0a45fa8f82d15f5d3c9380085847",
  "url": "https://osv.dev/vulnerability/CVE-2023-53231",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "erofs: Fix detection of atomic context",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: erofs: Fix detection of atomic context Current check for atomic context is not sufficient as z_erofs_decompressqueue_endio can be called under rcu lock from blk_mq_flush_plug_list(). See the stacktrace [1] In such case we should hand off the decompression work for async processing rather than trying to do sync decompression in current context. Patch fixes the detection by checking for rcu_read_lock_any_held() and while at it use more appropriate !in_task() check than in_atomic(). Background: Historically erofs would always schedule a kworker for decompression which would incur the scheduling cost regardless of the context. But z_erofs_decompressqueue_endio() may not always be in atomic context and we could actually benefit from doing the decompression in z_erofs_decompressqueue_endio() if we are in thread context, for example when running with dm-verity. This optimization was later added in patch [2] which has shown improvement in performance benchmarks. ============================================== [1] Problem stacktrace [name:core&]BUG: sleeping function called from invalid context at kernel/locking/mutex.c:291 [name:core&]in_atomic(): 0, irqs_disabled(): 0, non_block: 0, pid: 1615, name: CpuMonitorServi [name:core&]preempt_count: 0, expected: 0 [name:core&]RCU nest depth: 1, expected: 0 CPU: 7 PID: 1615 Comm: CpuMonitorServi Tainted: G S W OE 6.1.25-android14-5-maybe-dirty-mainline #1 Hardware name: MT689",
    "evidence": "osv:CVE-2023-53231",
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    "severity": "medium",
    "structured": {
      "id": "CVE-2023-53231",
      "aliases": [
        "CVE-2023-53231"
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      "metrics": [
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          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
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      "modified": "2026-10-28T02:30:23.837856511Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/12d0a24afd9ea58e581ea64d64e066f2027b28d9",
        "https://git.kernel.org/stable/c/597fb60c75132719687e173b75cab8f6eb1ca657",
        "https://git.kernel.org/stable/c/96bcd9650e15901201d964eef5f79d18a81daac8",
        "https://git.kernel.org/stable/c/c3446e50fb4dc39e2dfb5951a57bc175d38f68be",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53231.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53231",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
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    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 489885,
  "published_at": "2025-09-15T14:22:03.599+00:00"
}