CVE-2021-46924 NFC: st21nfca: Fix memory leak in device probe and remove

2024-02-2709:43:54

Linux

github.com

linux kernel

vulnerability

memory leak

st21nfca

device probe

error handling

remove path

AI Score

6.6

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

partial

JSON

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

NFC: st21nfca: Fix memory leak in device probe and remove

‘phy->pending_skb’ is alloced when device probe, but forgot to free
in the error handling path and remove path, this cause memory leak
as follows:

unreferenced object 0xffff88800bc06800 (size 512):
comm “8”, pid 11775, jiffies 4295159829 (age 9.032s)
hex dump (first 32 bytes):
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 …
backtrace:
[<00000000d66c09ce>] __kmalloc_node_track_caller+0x1ed/0x450
[<00000000c93382b3>] kmalloc_reserve+0x37/0xd0
[<000000005fea522c>] __alloc_skb+0x124/0x380
[<0000000019f29f9a>] st21nfca_hci_i2c_probe+0x170/0x8f2

Fix it by freeing ‘pending_skb’ in error and remove.

CNA Affected

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "68957303f44a",
        "lessThan": "38c3e320e7ff",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "68957303f44a",
        "lessThan": "a1e0080a35a1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "68957303f44a",
        "lessThan": "1cd4063dbc91",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "68957303f44a",
        "lessThan": "e553265ea564",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "68957303f44a",
        "lessThan": "238920381b89",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "68957303f44a",
        "lessThan": "1b9dadba5022",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/nfc/st21nfca/i2c.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.16"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.16",
        "versionType": "custom"
      },
      {
        "status": "unaffected",
        "version": "4.14.261",
        "versionType": "custom",
        "lessThanOrEqual": "4.14.*"
      },
      {
        "status": "unaffected",
        "version": "4.19.224",
        "versionType": "custom",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.170",
        "versionType": "custom",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.90",
        "versionType": "custom",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.13",
        "versionType": "custom",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "5.16",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/nfc/st21nfca/i2c.c"
    ],
    "defaultStatus": "affected"
  }
]