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ext4: update orig_path in ext4_find_extent()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ext4: update orig_path in ext4_find_extent() In ext4_find_extent(), if the path is not big enough, we free it and set *orig_path to NULL. But after reallocating and successfully initializing the path, we don't update *orig_path, in which case the caller gets a valid path but a NULL ppath, and this may cause a NULL pointer dereference or a path memory leak. For example: ext4_split_extent path = *ppath = 2000 ext4_find_extent if (depth > path[0].p_maxdepth) kfree(path = 2000); *orig_path = path = NULL; path = kcalloc() = 3000 ext4_split_extent_at(*ppath = NULL) path = *ppath; ex = path[depth].p_ext; // NULL pointer dereference! ================================================================== BUG: kernel NULL pointer dereference, address: 0000000000000010 CPU: 6 UID: 0 PID: 576 Comm: fsstress Not tainted 6.11.0-rc2-dirty #847 RIP: 0010:ext4_split_extent_at+0x6d/0x560 Call Trace: ext4_split_extent.isra.0+0xcb/0x1b0 ext4_ext_convert_to_initialized+0x168/0x6c0 ext4_ext_handle_unwritten_extents+0x325/0x4d0 ext4_ext_map_blocks+0x520/0xdb0 ext4_map_blocks+0x2b0/0x690 ext4_iomap_begin+0x20e/0x2c0 [...] ================================================================== Therefore, *orig_path is updated when the extent lookup succeeds, so that the caller can safely use path or *ppath.

Announced Source revision 1
Original source ↗

CVE-2024-49881

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-49881

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "ec0c0beb9b777cdd1edd7df9b36e0f3e67e2bdff",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "6766937d0327000ac1b87c97bbecdd28b0dd6599",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "a9fcb1717d75061d3653ed69365c8d45331815cd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "6801ed1298204d16a38571091e31178bfdc3c679",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "f55ecc58d07a6c1f6d6d5b5af125c25f8da0bda2",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "b63481b3a388ee2df9e295f97273226140422a42",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "11b230100d6801c014fab2afabc8bdea304c1b96",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "10809df84a4d868db61af621bae3658494165279",
        "lessThan": "5b4b2dcace35f618fe361a87bae6f0d13af31bc1",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ext4/extents.c",
      "fs/ext4/move_extent.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.18",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "4.19.323",
        "versionType": "semver",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.227",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.168",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.113",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.55",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.10.14",
        "versionType": "semver",
        "lessThanOrEqual": "6.10.*"
      },
      {
        "status": "unaffected",
        "version": "6.11.3",
        "versionType": "semver",
        "lessThanOrEqual": "6.11.*"
      },
      {
        "status": "unaffected",
        "version": "6.12",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ext4/extents.c",
      "fs/ext4/move_extent.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-49881

Source reference: /cveMetadata/cveId

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Event
#26745 · Revision 1
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