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

2024-02-2709:43:54

Linux

www.cve.org

nfc

st21nfca

memory leak

linux kernel

vulnerability

memory allocation

error handling

6.3 Medium

AI Score

Confidence

High

0.0004 Low

EPSS

Percentile

5.1%

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

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