ext4: fix another off-by-one fsmap error on 1k block filesystems

{
  "id": "3e8c2c61589406e7ae50d0cbbcee64ee0315457d14392fc2b6937606d39e666b",
  "url": "https://osv.dev/vulnerability/CVE-2023-53143",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: fix another off-by-one fsmap error on 1k block filesystems",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: fix another off-by-one fsmap error on 1k block filesystems Apparently syzbot figured out that issuing this FSMAP call: struct fsmap_head cmd = { .fmh_count = ...; .fmh_keys = { { .fmr_device = /* ext4 dev */, .fmr_physical = 0, }, { .fmr_device = /* ext4 dev */, .fmr_physical = 0, }, }, ... }; ret = ioctl(fd, FS_IOC_GETFSMAP, &cmd); Produces this crash if the underlying filesystem is a 1k-block ext4 filesystem: kernel BUG at fs/ext4/ext4.h:3331! invalid opcode: 0000 [#1] PREEMPT SMP CPU: 3 PID: 3227965 Comm: xfs_io Tainted: G W O 6.2.0-rc8-achx Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.15.0-1 04/01/2014 RIP: 0010:ext4_mb_load_buddy_gfp+0x47c/0x570 [ext4] RSP: 0018:ffffc90007c03998 EFLAGS: 00010246 RAX: ffff888004978000 RBX: ffffc90007c03a20 RCX: ffff888041618000 RDX: 0000000000000000 RSI: 00000000000005a4 RDI: ffffffffa0c99b11 RBP: ffff888012330000 R08: ffffffffa0c2b7d0 R09: 0000000000000400 R10: ffffc90007c03950 R11: 0000000000000000 R12: 0000000000000001 R13: 00000000ffffffff R14: 0000000000000c40 R15: ffff88802678c398 FS: 00007fdf2020c880(0000) GS:ffff88807e100000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007ffd318a5fe8 CR3: 000000007f80f001 CR4: 00000000001706e0 Call Trace: ext4_mballoc_query_range+0x4b/0x210 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80] ext4_getfsmap_datadev+0x713/0x890 [ext4 dfa189daddffe8fecd3cdfd00564e0f265a8ab80] ext",
    "evidence": "osv:CVE-2023-53143",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.103",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.1.20",
            "evidence": "/affected/1/ranges"
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          {
            "value": "6.2.7",
            "evidence": "/affected/1/ranges"
          }
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        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-53143",
      "aliases": [
        "CVE-2023-53143"
      ],
      "affected": [
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                  "fixed": "c24f838493792b5e78a3596b4ca96375aa0af4c2"
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            "ecosystem": "Linux"
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      ],
      "modified": "2026-10-28T02:30:30.999124124Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/15ebade3266b300da9cd1edce4004fe8fd6a2b88",
        "https://git.kernel.org/stable/c/1d2366624b4c19a2ba6baf67fe57f4a1b0f67c05",
        "https://git.kernel.org/stable/c/a70b49dc7eee5dbe3775a650ce598e3557ff5475",
        "https://git.kernel.org/stable/c/c24f838493792b5e78a3596b4ca96375aa0af4c2",
        "https://git.kernel.org/stable/c/c5d7c31e17224d847a330180ec1b03bf390632b2",
        "https://git.kernel.org/stable/c/c993799baf9c5861f8df91beb80e1611b12efcbd",
        "https://git.kernel.org/stable/c/eb3a695aa71a514f2e7f5778e05faba3733b70a0",
        "https://git.kernel.org/stable/c/f16054ac1774915160ca4e1c73ff7a269465a1b9",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53143.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-53143",
        "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/2023/53xxx/CVE-2023-53143.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-53143",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 497920,
  "published_at": "2025-05-02T15:56:13.656+00:00"
}