ext4: inline: fix len overflow in ext4_prepare_inline_data

{
  "id": "c1a65ceccbb61ae5c6b4981d075d7ea6c425c5c0c1a59a102b63d56813bb3015",
  "url": "https://osv.dev/vulnerability/CVE-2025-38222",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "ext4: inline: fix len overflow in ext4_prepare_inline_data",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: ext4: inline: fix len overflow in ext4_prepare_inline_data When running the following code on an ext4 filesystem with inline_data feature enabled, it will lead to the bug below. fd = open(\"file1\", O_RDWR | O_CREAT | O_TRUNC, 0666); ftruncate(fd, 30); pwrite(fd, \"a\", 1, (1UL << 40) + 5UL); That happens because write_begin will succeed as when ext4_generic_write_inline_data calls ext4_prepare_inline_data, pos + len will be truncated, leading to ext4_prepare_inline_data parameter to be 6 instead of 0x10000000006. Then, later when write_end is called, we hit: BUG_ON(pos + len > EXT4_I(inode)->i_inline_size); at ext4_write_inline_data. Fix it by using a loff_t type for the len parameter in ext4_prepare_inline_data instead of an unsigned int. [ 44.545164] ------------[ cut here ]------------ [ 44.545530] kernel BUG at fs/ext4/inline.c:240! [ 44.545834] Oops: invalid opcode: 0000 [#1] SMP NOPTI [ 44.546172] CPU: 3 UID: 0 PID: 343 Comm: test Not tainted 6.15.0-rc2-00003-g9080916f4863 #45 PREEMPT(full) 112853fcebfdb93254270a7959841d2c6aa2c8bb [ 44.546523] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 [ 44.546523] RIP: 0010:ext4_write_inline_data+0xfe/0x100 [ 44.546523] Code: 3c 0e 48 83 c7 48 48 89 de 5b 41 5c 41 5d 41 5e 41 5f 5d e9 e4 fa 43 01 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc cc 0f 0b <0f> 0b 0f 1f 44 00 00 55 41 57 41 56 41 55 41 54 53 48 83 ec 20 49 [ 44.",
    "evidence": "osv:CVE-2025-38222",
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    "severity": "unknown",
    "structured": {
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      "modified": "2026-10-28T02:30:45.801363748Z",
      "provider": "osv",
      "references": [
        "https://cert-portal.siemens.com/productcert/html/ssa-082556.html",
        "https://git.kernel.org/stable/c/227cb4ca5a6502164f850d22aec3104d7888b270",
        "https://git.kernel.org/stable/c/26e09d18599da0adc543eabd300080daaeda6869",
        "https://git.kernel.org/stable/c/5766da2237e539f259aa0e5f3639ae37b44ca458",
        "https://git.kernel.org/stable/c/717414a8c083c376d4a8940a1230fe0c6ed4ee00",
        "https://git.kernel.org/stable/c/9d1d1c5bf4fc1af76be154d3afb2acdbd89ec7d8",
        "https://git.kernel.org/stable/c/cf5f319a2d8ab8238f8cf3a19463b9bff6420934",
        "https://git.kernel.org/stable/c/d3dfc60efd145df5324b99a244b0b05505cde29b",
        "https://git.kernel.org/stable/c/e80ee0263d88d77f2fd1927f915003a7066cbb50",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html",
        "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38222.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-38222",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
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    "security_relevant": true,
    "severity_evidence": null
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  "source_id": "core-osv",
  "document_id": 513508,
  "published_at": "2025-07-04T13:37:37.879+00:00"
}