f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count()

{
  "id": "761b92df56f0c580f43def0debd912f73ec2185f0ec5f0b762db2bcd465e8e0c",
  "url": "https://osv.dev/vulnerability/CVE-2022-49380",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid f2fs_bug_on() in dec_valid_node_count() As Yanming reported in bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=215897 I have encountered a bug in F2FS file system in kernel v5.17. The kernel should enable CONFIG_KASAN=y and CONFIG_KASAN_INLINE=y. You can reproduce the bug by running the following commands: The kernel message is shown below: kernel BUG at fs/f2fs/f2fs.h:2511! Call Trace: f2fs_remove_inode_page+0x2a2/0x830 f2fs_evict_inode+0x9b7/0x1510 evict+0x282/0x4e0 do_unlinkat+0x33a/0x540 __x64_sys_unlinkat+0x8e/0xd0 do_syscall_64+0x3b/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae The root cause is: .total_valid_block_count or .total_valid_node_count could fuzzed to zero, then once dec_valid_node_count() was called, it will cause BUG_ON(), this patch fixes to print warning info and set SBI_NEED_FSCK into CP instead of panic.",
    "evidence": "osv:CVE-2022-49380",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "value": "5.17.14",
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            "value": "5.18.3",
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    "severity": "unknown",
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      "id": "CVE-2022-49380",
      "aliases": [
        "CVE-2022-49380"
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      "modified": "2026-10-28T02:30:24.273646195Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2766ddaf45b69252bb8fe526b5b6e56904a9ae7a",
        "https://git.kernel.org/stable/c/4d17e6fe9293d57081ffdc11e1cf313e25e8fd9e",
        "https://git.kernel.org/stable/c/89d9a48d0cd30429463ea4e37ca83be6773ed5eb",
        "https://git.kernel.org/stable/c/bce859358d3d5940aa858e40ceee70ee6e76130e",
        "https://git.kernel.org/stable/c/ccffa99ae6a1f44797b57444c6a80382a42928fe",
        "https://git.kernel.org/stable/c/f8b3c3fcf33105bc1ee7788e3b51b0a1ae42ae53",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49380.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2022-49380",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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        "cna_assigner": "Linux",
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        "evidence": "/id"
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    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 490843,
  "published_at": "2025-02-26T02:11:18.314+00:00"
}