CVE-2023-52473 thermal: core: Fix NULL pointer dereference in zone registration error path

2024-02-2508:16:35

Linux

www.cve.org

linux kernel vulnerability

core fix

null pointer

registration error

zone device

5.8 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

5.1%

JSON

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

thermal: core: Fix NULL pointer dereference in zone registration error path

If device_register() in thermal_zone_device_register_with_trips()
returns an error, the tz variable is set to NULL and subsequently
dereferenced in kfree(tz->tzp).

Commit adc8749b150c (“thermal/drivers/core: Use put_device() if
device_register() fails”) added the tz = NULL assignment in question to
avoid a possible double-free after dropping the reference to the zone
device. However, after commit 4649620d9404 (“thermal: core: Make
thermal_zone_device_unregister() return after freeing the zone”), that
assignment has become redundant, because dropping the reference to the
zone device does not cause the zone object to be freed any more.

Drop it to address the NULL pointer dereference.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/thermal/thermal_core.c"
    ],
    "versions": [
      {
        "version": "3d439b1a2ad3",
        "lessThan": "335176dd8eba",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3d439b1a2ad3",
        "lessThan": "02871710b930",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "3d439b1a2ad3",
        "lessThan": "04e6ccfc93c5",
        "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/thermal/thermal_core.c"
    ],
    "versions": [
      {
        "version": "6.4",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "6.4",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.14",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.7.2",
        "lessThanOrEqual": "6.7.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.8",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]