CVE-2024-43885 btrfs: fix double inode unlock for direct IO sync writes

2024-08-2610:10:36

Linux

www.cve.org

linux kernel

vulnerability

btrfs

direct io

sync writes

inode unlock

fix

EPSS

Percentile

5.0%

JSON

In the Linux kernel, the following vulnerability has been resolved:

btrfs: fix double inode unlock for direct IO sync writes

If we do a direct IO sync write, at btrfs_sync_file(), and we need to skip
inode logging or we get an error starting a transaction or an error when
flushing delalloc, we end up unlocking the inode when we shouldn’t under
the ‘out_release_extents’ label, and then unlock it again at
btrfs_direct_write().

Fix that by checking if we have to skip inode unlocking under that label.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/btrfs/file.c"
    ],
    "versions": [
      {
        "version": "4e17707035a6",
        "lessThan": "1a607d22dea4",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "6cae8d04d8b3",
        "lessThan": "8bd4c9220416",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "0a108bde616a",
        "lessThan": "7ba27f14161f",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3831170f7406",
        "lessThan": "d924a0be2f21",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "939b656bc8ab",
        "lessThan": "e0391e92f9ab",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/btrfs/file.c"
    ],
    "versions": [
      {
        "version": "6.11-rc2",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.11-rc2",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11-rc3",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]