Hello Lee.

After the 0a3fe972a7cb14 ("HID: core: Mitigate potential OOB by removing bogus memset()") commit I observe the following flood in dmesg:

kernel: hid_report_raw_event: 6 callbacks suppressed
kernel: hid-generic 0003:051D:0002.0005: Event data for report 22 was too short (4 vs 2)
kernel: hid-generic 0003:051D:0002.0005: Event data for report 22 was too short (4 vs 2)
kernel: hid-generic 0003:051D:0002.0005: Event data for report 22 was too short (4 vs 2)

This machine has got an APC UPS attached:

Bus 001 Device 007: ID 051d:0002 American Power Conversion Uninterruptible Power Supply

Once I unplug the UPS USB cable, the flood stops.

IIUC apart from the rest, the commit changes the message verbosity from debug to warning. Maybe hid_dbg_ratelimited() should be used instead?

Thank you.

---

lsusb -vv on this device:

Bus 001 Device 007: ID 051d:0002 American Power Conversion Uninterruptible Power Supply
Negotiated speed: Full Speed (12Mbps)
Device Descriptor:
  bLength                18
  bDescriptorType         1
  bcdUSB               2.00
  bDeviceClass            0 [unknown]
  bDeviceSubClass         0 [unknown]
  bDeviceProtocol         0
  bMaxPacketSize0        64
  idVendor           0x051d American Power Conversion
  idProduct          0x0002 Uninterruptible Power Supply
  bcdDevice            1.06
  iManufacturer           1 American Power Conversion
  iProduct                2 Back-UPS BX1200MI FW:294201G -302201G
  iSerial                 3 9B2105A23830
  bNumConfigurations      1
  Configuration Descriptor:
    bLength                 9
    bDescriptorType         2
    wTotalLength       0x0022
    bNumInterfaces          1
    bConfigurationValue     1
    iConfiguration          0
    bmAttributes         0xa0
      (Bus Powered)
      Remote Wakeup
    MaxPower              100mA
    Interface Descriptor:
      bLength                 9
      bDescriptorType         4
      bInterfaceNumber        0
      bAlternateSetting       0
      bNumEndpoints           1
      bInterfaceClass         3 Human Interface Device
      bInterfaceSubClass      0 [unknown]
      bInterfaceProtocol      0
      iInterface              0
        HID Device Descriptor:
          bLength                 9
          bDescriptorType        33
          bcdHID               1.10
          bCountryCode           33 US
          bNumDescriptors         1
          bDescriptorType        34 Report
          wDescriptorLength     745
          Report Descriptors:
            ** UNAVAILABLE **
      Endpoint Descriptor:
        bLength                 7
        bDescriptorType         5
        bEndpointAddress     0x81  EP 1 IN
        bmAttributes            3
          Transfer Type            Interrupt
          Synch Type               None
          Usage Type               Data
        wMaxPacketSize     0x0006  1x 6 bytes
        bInterval              10
Device Status:     0x0002
  (Bus Powered)
  Remote Wakeup Enabled

-- 
Oleksandr Natalenko, MSE