dma-debug: don't call __dma_entry_alloc_check_leak() under free_entries_lock

{
  "id": "2ae5425ea67cf640e4c0d91d70a46c991c75566a08661f3cc800128b6743175f",
  "url": "https://osv.dev/vulnerability/CVE-2023-52516",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dma-debug: don't call __dma_entry_alloc_check_leak() under free_entries_lock",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dma-debug: don't call __dma_entry_alloc_check_leak() under free_entries_lock __dma_entry_alloc_check_leak() calls into printk -> serial console output (qcom geni) and grabs port->lock under free_entries_lock spin lock, which is a reverse locking dependency chain as qcom_geni IRQ handler can call into dma-debug code and grab free_entries_lock under port->lock. Move __dma_entry_alloc_check_leak() call out of free_entries_lock scope so that we don't acquire serial console's port->lock under it. Trimmed-down lockdep splat: The existing dependency chain (in reverse order) is: -> #2 (free_entries_lock){-.-.}-{2:2}: _raw_spin_lock_irqsave+0x60/0x80 dma_entry_alloc+0x38/0x110 debug_dma_map_page+0x60/0xf8 dma_map_page_attrs+0x1e0/0x230 dma_map_single_attrs.constprop.0+0x6c/0xc8 geni_se_rx_dma_prep+0x40/0xcc qcom_geni_serial_isr+0x310/0x510 __handle_irq_event_percpu+0x110/0x244 handle_irq_event_percpu+0x20/0x54 handle_irq_event+0x50/0x88 handle_fasteoi_irq+0xa4/0xcc handle_irq_desc+0x28/0x40 generic_handle_domain_irq+0x24/0x30 gic_handle_irq+0xc4/0x148 do_interrupt_handler+0xa4/0xb0 el1_interrupt+0x34/0x64 el1h_64_irq_handler+0x18/0x24 el1h_64_irq+0x64/0x68 arch_local_irq_enable+0x4/0x8 ____do_softirq+0x18/0x24 ... -> #1 (&port_lock_key){-.-.}-{2:2}: _raw_spin_lock_irqsave+0x60/0x80 qcom_geni_serial_console_write+0x184/0x1dc console_flush_all+0x344/0x454 console_unlock+0x94/0xf0 vprintk_emit+0x238/0x24c vprintk_default",
    "evidence": "osv:CVE-2023-52516",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.10.198",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "5.15.134",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.56",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.5.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2023-52516",
      "aliases": [
        "CVE-2023-52516"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                  "introduced": "ceb51173b2b5bd7af0d99079f6bbacdcfc58fe08"
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                {
                  "fixed": "c79300599923daaa30f417c75555d5566b3d31ae"
                },
                {
                  "fixed": "ac0d068099349cbca3d93f2e3b15bb329364b08c"
                },
                {
                  "fixed": "be8f49029eca3efbad0d74dbff3cb9129994ffab"
                },
                {
                  "fixed": "fe2b811a02c3244ebf6059039e4a9e715e26a9e3"
                },
                {
                  "fixed": "fb5a4315591dae307a65fc246ca80b5159d296e1"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52516.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.0.0"
                },
                {
                  "fixed": "5.10.198"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.11.0"
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                {
                  "fixed": "5.15.134"
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              ]
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            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.16.0"
                },
                {
                  "fixed": "6.1.56"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.5.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2023-52516.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:25.093831251Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/ac0d068099349cbca3d93f2e3b15bb329364b08c",
        "https://git.kernel.org/stable/c/be8f49029eca3efbad0d74dbff3cb9129994ffab",
        "https://git.kernel.org/stable/c/c79300599923daaa30f417c75555d5566b3d31ae",
        "https://git.kernel.org/stable/c/fb5a4315591dae307a65fc246ca80b5159d296e1",
        "https://git.kernel.org/stable/c/fe2b811a02c3244ebf6059039e4a9e715e26a9e3",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52516.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52516",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52516.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-52516",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 491293,
  "published_at": "2024-03-02T21:52:26.517+00:00"
}