CVE-2021-47205

2024-04-1019:15:48

416baaa9-dc9f-4396-8d5f-8c081fb06d67

web.nvd.nist.gov

linux kernel

sunxi-ng

vulnerability

clock driver

memory leak

6.3 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

8.8%

JSON

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

clk: sunxi-ng: Unregister clocks/resets when unbinding

Currently, unbinding a CCU driver unmaps the device’s MMIO region, while
leaving its clocks/resets and their providers registered. This can cause
a page fault later when some clock operation tries to perform MMIO. Fix
this by separating the CCU initialization from the memory allocation,
and then using a devres callback to unregister the clocks and resets.

This also fixes a memory leak of the struct ccu_reset, and uses the
correct owner (the specific platform driver) for the clocks and resets.

Early OF clock providers are never unregistered, and limited error
handling is possible, so they are mostly unchanged. The error reporting
is made more consistent by moving the message inside of_sunxi_ccu_probe.

Affected configurations

Vulners

Node

linuxlinux_kernelRange5.15.0–5.15.5

linuxlinux_kernelRange5.16.0≥

VendorProductVersionCPE
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linuxlinux_kernel*cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	*	cpe:2.3:o:linux:linux_kernel::::::::

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/clk/sunxi-ng/ccu-sun4i-a10.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-a100-r.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-a100.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-a64.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-h6.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-h616.c",
      "drivers/clk/sunxi-ng/ccu-sun5i.c",
      "drivers/clk/sunxi-ng/ccu-sun6i-a31.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-a23.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-a33.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-a83t.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-de2.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-h3.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-r.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-r40.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-v3s.c",
      "drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c",
      "drivers/clk/sunxi-ng/ccu-sun9i-a80-usb.c",
      "drivers/clk/sunxi-ng/ccu-sun9i-a80.c",
      "drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c",
      "drivers/clk/sunxi-ng/ccu_common.c",
      "drivers/clk/sunxi-ng/ccu_common.h"
    ],
    "versions": [
      {
        "version": "1da177e4c3f4",
        "lessThan": "b5dd513daa70",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "1da177e4c3f4",
        "lessThan": "9bec2b9c6134",
        "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/sunxi-ng/ccu-sun4i-a10.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-a100-r.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-a100.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-a64.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-h6-r.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-h6.c",
      "drivers/clk/sunxi-ng/ccu-sun50i-h616.c",
      "drivers/clk/sunxi-ng/ccu-sun5i.c",
      "drivers/clk/sunxi-ng/ccu-sun6i-a31.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-a23.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-a33.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-a83t.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-de2.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-h3.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-r.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-r40.c",
      "drivers/clk/sunxi-ng/ccu-sun8i-v3s.c",
      "drivers/clk/sunxi-ng/ccu-sun9i-a80-de.c",
      "drivers/clk/sunxi-ng/ccu-sun9i-a80-usb.c",
      "drivers/clk/sunxi-ng/ccu-sun9i-a80.c",
      "drivers/clk/sunxi-ng/ccu-suniv-f1c100s.c",
      "drivers/clk/sunxi-ng/ccu_common.c",
      "drivers/clk/sunxi-ng/ccu_common.h"
    ],
    "versions": [
      {
        "version": "5.15.5",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]