CVE-2021-47523 IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr

2024-05-2415:09:36

Linux

www.cve.org

linux kernel

ib/hfi1

vulnerability

fix

memory leak

6.6 Medium

AI Score

Confidence

Low

0.0004 Low

EPSS

Percentile

15.6%

JSON

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

IB/hfi1: Fix leak of rcvhdrtail_dummy_kvaddr

This buffer is currently allocated in hfi1_init():

if (reinit)
	ret = init_after_reset(dd);
else
	ret = loadtime_init(dd);
if (ret)
	goto done;

/* allocate dummy tail memory for all receive contexts */
dd-&gt;rcvhdrtail_dummy_kvaddr = dma_alloc_coherent(&dd-&gt;pcidev-&gt;dev,
						 sizeof(u64),
						 &dd-&gt;rcvhdrtail_dummy_dma,
						 GFP_KERNEL);

if (!dd-&gt;rcvhdrtail_dummy_kvaddr) {
	dd_dev_err(dd, "cannot allocate dummy tail memory\n");
	ret = -ENOMEM;
	goto done;
}

The reinit triggered path will overwrite the old allocation and leak it.

Fix by moving the allocation to hfi1_alloc_devdata() and the deallocation
to hfi1_free_devdata().

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "drivers/infiniband/hw/hfi1/init.c"
    ],
    "versions": [
      {
        "version": "46b010d3eeb8",
        "lessThan": "2c08271f4ed0",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "46b010d3eeb8",
        "lessThan": "834d0fb97864",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "46b010d3eeb8",
        "lessThan": "60a8b5a1611b",
        "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/infiniband/hw/hfi1/init.c"
    ],
    "versions": [
      {
        "version": "4.5",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "4.5",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.85",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.8",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.16",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]