github - ghsa-4jc7-pp7p-f6px

GHSA-4JC7-PP7P-F6PX

Vulnerability from github – Published: 2024-09-27 15:30 – Updated: 2024-10-04 15:31

Details

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

drm/amd/display: Avoid race between dcn35_set_drr() and dc_state_destruct()

dc_state_destruct() nulls the resource context of the DC state. The pipe context passed to dcn35_set_drr() is a member of this resource context.

If dc_state_destruct() is called parallel to the IRQ processing (which calls dcn35_set_drr() at some point), we can end up using already nulled function callback fields of struct stream_resource.

The logic in dcn35_set_drr() already tries to avoid this, by checking tg against NULL. But if the nulling happens exactly after the NULL check and before the next access, then we get a race.

Avoid this by copying tg first to a local variable, and then use this variable for all the operations. This should work, as long as nobody frees the resource pool where the timing generators live.

(cherry picked from commit 0607a50c004798a96e62c089a4c34c220179dcb5)

Severity ?

4.7 (Medium)


                  
                    CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2024-46850"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-09-27T13:15:16Z",
    "severity": "MODERATE"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: Avoid race between dcn35_set_drr() and dc_state_destruct()\n\ndc_state_destruct() nulls the resource context of the DC state. The pipe\ncontext passed to dcn35_set_drr() is a member of this resource context.\n\nIf dc_state_destruct() is called parallel to the IRQ processing (which\ncalls dcn35_set_drr() at some point), we can end up using already nulled\nfunction callback fields of struct stream_resource.\n\nThe logic in dcn35_set_drr() already tries to avoid this, by checking tg\nagainst NULL. But if the nulling happens exactly after the NULL check and\nbefore the next access, then we get a race.\n\nAvoid this by copying tg first to a local variable, and then use this\nvariable for all the operations. This should work, as long as nobody\nfrees the resource pool where the timing generators live.\n\n(cherry picked from commit 0607a50c004798a96e62c089a4c34c220179dcb5)",
  "id": "GHSA-4jc7-pp7p-f6px",
  "modified": "2024-10-04T15:31:12Z",
  "published": "2024-09-27T15:30:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-46850"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/42850927656a540428e58d370b3c1599a617bac7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e835d5144f5ef78e4f8828c63e2f0d61144f283a"
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  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2024-46850 (GCVE-0-2024-46850)

Vulnerability from cvelistv5 – Published: 2024-09-27 12:42 – Updated: 2025-05-04 09:35

Summary

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Avoid race between dcn35_set_drr() and dc_state_destruct() dc_state_destruct() nulls the resource context of the DC state. The pipe context passed to dcn35_set_drr() is a member of this resource context. If dc_state_destruct() is called parallel to the IRQ processing (which calls dcn35_set_drr() at some point), we can end up using already nulled function callback fields of struct stream_resource. The logic in dcn35_set_drr() already tries to avoid this, by checking tg against NULL. But if the nulling happens exactly after the NULL check and before the next access, then we get a race. Avoid this by copying tg first to a local variable, and then use this variable for all the operations. This should work, as long as nobody frees the resource pool where the timing generators live. (cherry picked from commit 0607a50c004798a96e62c089a4c34c220179dcb5)

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/42850927656a54042…
	https://git.kernel.org/stable/c/e835d5144f5ef78e4…

Impacted products

Vendor

Product

Version

Linux

Affected: 06ad7e16425619a4a77154c2e85bededb3e04a4f , < 42850927656a540428e58d370b3c1599a617bac7 (git)
Affected: 06ad7e16425619a4a77154c2e85bededb3e04a4f , < e835d5144f5ef78e4f8828c63e2f0d61144f283a (git)

Linux

Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.10.11 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)

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Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

GHSA-4JC7-PP7P-F6PX

CVE-2024-46850 (GCVE-0-2024-46850)

Tags

Sightings

Nomenclature