CVE-2023-52811 (GCVE-0-2023-52811)
Vulnerability from cvelistv5
Published
2024-05-21 15:31
Modified
2025-05-04 07:43
Severity ?
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: ibmvfc: Remove BUG_ON in the case of an empty event pool In practice the driver should never send more commands than are allocated to a queue's event pool. In the unlikely event that this happens, the code asserts a BUG_ON, and in the case that the kernel is not configured to crash on panic returns a junk event pointer from the empty event list causing things to spiral from there. This BUG_ON is a historical artifact of the ibmvfc driver first being upstreamed, and it is well known now that the use of BUG_ON is bad practice except in the most unrecoverable scenario. There is nothing about this scenario that prevents the driver from recovering and carrying on. Remove the BUG_ON in question from ibmvfc_get_event() and return a NULL pointer in the case of an empty event pool. Update all call sites to ibmvfc_get_event() to check for a NULL pointer and perfrom the appropriate failure or recovery action.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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In the unlikely event that this happens, the code\\nasserts a BUG_ON, and in the case that the kernel is not configured to\\ncrash on panic returns a junk event pointer from the empty event list\\ncausing things to spiral from there. This BUG_ON is a historical artifact\\nof the ibmvfc driver first being upstreamed, and it is well known now that\\nthe use of BUG_ON is bad practice except in the most unrecoverable\\nscenario. There is nothing about this scenario that prevents the driver\\nfrom recovering and carrying on.\\n\\nRemove the BUG_ON in question from ibmvfc_get_event() and return a NULL\\npointer in the case of an empty event pool. Update all call sites to\\nibmvfc_get_event() to check for a NULL pointer and perfrom the appropriate\\nfailure or recovery action.\"}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2024-12-19T08:26:29.730Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-52811\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-12-19T08:26:29.730Z\", \"dateReserved\": \"2024-05-21T15:19:24.248Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-21T15:31:20.282Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.1"
    }
  }
}