CVE-2024-44971 net: dsa: bcm_sf2: Fix a possible memory leak in bcm_sf2_mdio_register()

2024-09-0418:56:47

Linux

www.cve.org

linux kernel

bcm_sf2_mdio_register

memory leak

net

dsa

cve-2024-44971

EPSS

Percentile

5.1%

JSON

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

net: dsa: bcm_sf2: Fix a possible memory leak in bcm_sf2_mdio_register()

bcm_sf2_mdio_register() calls of_phy_find_device() and then
phy_device_remove() in a loop to remove existing PHY devices.
of_phy_find_device() eventually calls bus_find_device(), which calls
get_device() on the returned struct device * to increment the refcount.
The current implementation does not decrement the refcount, which causes
memory leak.

This commit adds the missing phy_device_free() call to decrement the
refcount via put_device() to balance the refcount.

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/net/dsa/bcm_sf2.c"
    ],
    "versions": [
      {
        "version": "771089c2a485",
        "lessThan": "b7b8d9f5e679",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "771089c2a485",
        "lessThan": "c05516c07290",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "771089c2a485",
        "lessThan": "7feef10768ea",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "771089c2a485",
        "lessThan": "a7d2808d6757",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "771089c2a485",
        "lessThan": "f3d5efe18a11",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "771089c2a485",
        "lessThan": "e3862093ee93",
        "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/net/dsa/bcm_sf2.c"
    ],
    "versions": [
      {
        "version": "5.10",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.10",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.224",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.165",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.105",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.46",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.5",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]