CVE-2020-36781 i2c: imx: fix reference leak when pm_runtime_get_sync fails

2024-02-2808:13:03

Linux

github.com

linux kernel

vulnerability

reference leak

i2c

imx

pm_runtime_get_sync

pm_runtime_resume_and_get

cve-2020-36781

AI Score

6.7

Confidence

Low

EPSS

Percentile

15.5%

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

i2c: imx: fix reference leak when pm_runtime_get_sync fails

In i2c_imx_xfer() and i2c_imx_remove(), the pm reference count
is not expected to be incremented on return.

However, pm_runtime_get_sync will increment pm reference count
even failed. Forgetting to putting operation will result in a
reference leak here.

Replace it with pm_runtime_resume_and_get to keep usage
counter balanced.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3a5ee18d2a32",
        "lessThan": "3a0cdd336d92",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a5ee18d2a32",
        "lessThan": "1ecc0ebc2ebb",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a5ee18d2a32",
        "lessThan": "ff406f6cd09c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "3a5ee18d2a32",
        "lessThan": "47ff617217ca",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/i2c/busses/i2c-imx.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.7"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.7",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "5.10.37",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.11.21",
        "versionType": "custom",
        "lessThanOrEqual": "5.11.*"
      },
      {
        "status": "unaffected",
        "version": "5.12.4",
        "versionType": "custom",
        "lessThanOrEqual": "5.12.*"
      },
      {
        "status": "unaffected",
        "version": "5.13",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/i2c/busses/i2c-imx.c"
    ],
    "defaultStatus": "affected"
  }
]