CVE-2024-39462 clk: bcm: dvp: Assign ->num before accessing ->hws

2024-06-2514:25:02

Linux

www.cve.org

linux kernel

cve-2024-39462

clk

bcm

dvp

assign

num

accessing

hws

vulnerability

resolved

struct

clk_hw_onecell_data

bounds sanitizer

array-index-out-of-bounds

0.0004 Low

EPSS

Percentile

15.7%

JSON

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

clk: bcm: dvp: Assign ->num before accessing ->hws

Commit f316cdff8d67 (“clk: Annotate struct clk_hw_onecell_data with
__counted_by”) annotated the hws member of ‘struct clk_hw_onecell_data’
with __counted_by, which informs the bounds sanitizer about the number
of elements in hws, so that it can warn when hws is accessed out of
bounds. As noted in that change, the __counted_by member must be
initialized with the number of elements before the first array access
happens, otherwise there will be a warning from each access prior to the
initialization because the number of elements is zero. This occurs in
clk_dvp_probe() due to ->num being assigned after ->hws has been
accessed:

UBSAN: array-index-out-of-bounds in drivers/clk/bcm/clk-bcm2711-dvp.c:59:2
index 0 is out of range for type ‘struct clk_hw *[] __counted_by(num)’ (aka ‘struct clk_hw *[]’)

Move the ->num initialization to before the first access of ->hws, which
clears up the warning.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/clk/bcm/clk-bcm2711-dvp.c"
    ],
    "versions": [
      {
        "version": "f316cdff8d67",
        "lessThan": "0dc913217fb7",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f316cdff8d67",
        "lessThan": "a1dd92fca0d6",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "f316cdff8d67",
        "lessThan": "9368cdf90f52",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/clk/bcm/clk-bcm2711-dvp.c"
    ],
    "versions": [
      {
        "version": "6.6",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.6",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.34",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.9.5",
        "lessThanOrEqual": "6.9.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10-rc1",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]