{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2024-56670",
  "modified": "2026-10-07T17:22:01Z",
  "upstream": [
    "CVE-2024-56670"
  ],
  "published": "2024-12-27T15:08:24Z",
  "summary": "usb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nusb: gadget: u_serial: Fix the issue that gs_start_io crashed due to accessing null pointer\n\nConsidering that in some extreme cases,\nwhen u_serial driver is accessed by multiple threads,\nThread A is executing the open operation and calling the gs_open,\nThread B is executing the disconnect operation and calling the\ngserial_disconnect function,The port->port_usb pointer will be set to NULL.\n\nE.g.\n    Thread A                                 Thread B\n    gs_open()                                gadget_unbind_driver()\n    gs_start_io()                            composite_disconnect()\n    gs_start_rx()                            gserial_disconnect()\n    ...                                      ...\n    spin_unlock(&port->port_lock)\n    status = usb_ep_queue()                  spin_lock(&port->port_lock)\n    spin_lock(&port->port_lock)              port->port_usb = NULL\n    gs_free_requests(port->port_usb->in)     spin_unlock(&port->port_lock)\n    Crash\n\nThis causes thread A to access a null pointer (port->port_usb is null)\nwhen calling the gs_free_requests function, causing a crash.\n\nIf port_usb is NULL, the release request will be skipped as it\nwill be done by gserial_disconnect.\n\nSo add a null pointer check to gs_start_io before attempting\nto access the value of the pointer port->port_usb.\n\nCall trace:\n gs_start_io+0x164/0x25c\n gs_open+0x108/0x13c\n tty_open+0x314/0x638\n chrdev_open+0x1b8/0x258\n do_dentry_open+0x2c4/0x700\n vfs_open+0x2c/0x3c\n path_openat+0xa64/0xc60\n do_filp_open+0xb8/0x164\n do_sys_openat2+0x84/0xf0\n __arm64_sys_openat+0x70/0x9c\n invoke_syscall+0x58/0x114\n el0_svc_common+0x80/0xe0\n do_el0_svc+0x1c/0x28\n el0_svc+0x38/0x68",
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2024-56670"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4efdfdc32d8d6307f968cd99f1db64468471bab1"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/28b3c03a6790de1f6f2683919ad657840f0f0f58"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1247e1df086aa6c17ab53cd1bedce70dd7132765"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c83213b6649d22656b3a4e92544ceeea8a2c6c07"
    },
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      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8ca07a3d18f39b1669927ef536e485787e856df6"
    },
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      "url": "https://git.kernel.org/stable/c/dd6b0ca6025f64ccb465a6a3460c5b0307ed9c44"
    },
    {
      "type": "FIX",
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    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-05-12T04:54:46Z"
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}