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padata: Fix possible divide-by-0 panic in padata_mt_helper()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: padata: Fix possible divide-by-0 panic in padata_mt_helper() We are hit with a not easily reproducible divide-by-0 panic in padata.c at bootup time. [ 10.017908] Oops: divide error: 0000 1 PREEMPT SMP NOPTI [ 10.017908] CPU: 26 PID: 2627 Comm: kworker/u1666:1 Not tainted 6.10.0-15.el10.x86_64 #1 [ 10.017908] Hardware name: Lenovo ThinkSystem SR950 [7X12CTO1WW]/[7X12CTO1WW], BIOS [PSE140J-2.30] 07/20/2021 [ 10.017908] Workqueue: events_unbound padata_mt_helper [ 10.017908] RIP: 0010:padata_mt_helper+0x39/0xb0 : [ 10.017963] Call Trace: [ 10.017968] [ 10.018004] ? padata_mt_helper+0x39/0xb0 [ 10.018084] process_one_work+0x174/0x330 [ 10.018093] worker_thread+0x266/0x3a0 [ 10.018111] kthread+0xcf/0x100 [ 10.018124] ret_from_fork+0x31/0x50 [ 10.018138] ret_from_fork_asm+0x1a/0x30 [ 10.018147] Looking at the padata_mt_helper() function, the only way a divide-by-0 panic can happen is when ps->chunk_size is 0. The way that chunk_size is initialized in padata_do_multithreaded(), chunk_size can be 0 when the min_chunk in the passed-in padata_mt_job structure is 0. Fix this divide-by-0 panic by making sure that chunk_size will be at least 1 no matter what the input parameters are.

Announced Source revision 1
Original source ↗

CVE-2024-43889

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-2024-43889

Linux

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

Affected versions
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Fixed versions
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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": "004ed42638f4428e70ead59d170f3d17ff761a0f",
        "lessThan": "ab8b397d5997d8c37610252528edc54bebf9f6d3",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004ed42638f4428e70ead59d170f3d17ff761a0f",
        "lessThan": "8f5ffd2af7274853ff91d6cd62541191d9fbd10d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004ed42638f4428e70ead59d170f3d17ff761a0f",
        "lessThan": "a29cfcb848c31f22b4de6a531c3e1d68c9bfe09f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004ed42638f4428e70ead59d170f3d17ff761a0f",
        "lessThan": "924f788c906dccaca30acab86c7124371e1d6f2c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004ed42638f4428e70ead59d170f3d17ff761a0f",
        "lessThan": "da0ffe84fcc1627a7dff82c80b823b94236af905",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "004ed42638f4428e70ead59d170f3d17ff761a0f",
        "lessThan": "6d45e1c948a8b7ed6ceddb14319af69424db730c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "kernel/padata.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.8"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.8",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.224",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.165",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.10.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.10.*"
      },
      {
        "status": "unaffected",
        "version": "6.11",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "kernel/padata.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-43889

Source reference: /cveMetadata/cveId

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Event
#26696 · Revision 1
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