linux-kernel - Re: [BUG] Kmemleak, possibly hiddev_connect(), in 6.3.0+ torvalds tree commit gfc4354c6e5c2

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Date:   Mon, 8 May 2023 09:40:33 +0200
From:   Mirsad Todorovac <mirsad.todorovac@....unizg.hr>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Mirsad Goran Todorovac <mirsad.goran.todorovac@....hr>
Cc:     linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-input@...r.kernel.org,
        Benjamin Tissoires <benjamin.tissoires@...hat.com>,
        Jiri Kosina <jikos@...nel.org>
Subject: Re: [BUG] Kmemleak, possibly hiddev_connect(), in 6.3.0+ torvalds
 tree commit gfc4354c6e5c2

On 5/8/23 08:51, Greg Kroah-Hartman wrote:
> On Mon, May 08, 2023 at 08:30:07AM +0200, Mirsad Goran Todorovac wrote:
>> Hi,
>>
>> There seems to be a kernel memory leak in the USB keyboard driver.
>>
>> The leaked memory allocs are 96 and 512 bytes.
>>
>> The platform is Ubuntu 22.04 LTS on a assembled AMD Ryzen 9 with X670E PG
>> Lightning mobo,
>> and Genius SlimStar i220 GK-080012 keyboard.
>>
>> (Logitech M100 HID mouse is not affected by the bug.)
>>
>> BIOS is:
>>
>>       *-firmware
>>            description: BIOS
>>            vendor: American Megatrends International, LLC.
>>            physical id: 0
>>            version: 1.21
>>            date: 04/26/2023
>>            size: 64KiB
>>
>> The kernel is 6.3.0-torvalds-<id>-13466-gfc4354c6e5c2.
>>
>> The keyboard is recognised as Chicony:
>>
>>                   *-usb
>>                        description: Keyboard
>>                        product: CHICONY USB Keyboard
>>                        vendor: CHICONY
>>                        physical id: 2
>>                        bus info: usb@5:2
>>                        logical name: input35
>>                        logical name: /dev/input/event4
>>                        logical name: input35::capslock
>>                        logical name: input35::numlock
>>                        logical name: input35::scrolllock
>>                        logical name: input36
>>                        logical name: /dev/input/event5
>>                        logical name: input37
>>                        logical name: /dev/input/event6
>>                        logical name: input38
>>                        logical name: /dev/input/event8
>>                        version: 2.30
>>                        capabilities: usb-2.00 usb
>>                        configuration: driver=usbhid maxpower=100mA
>> speed=1Mbit/s
>>
>> The bug is easily reproduced by unplugging the USB keyboard, waiting about a
>> couple of seconds,
>> and then reconnect and scan for memory leaks twice.
>>
>> The kmemleak log is as follows [edited privacy info]:
>>
>> root@...tname:/home/username# cat /sys/kernel/debug/kmemleak
>> unreferenced object 0xffff8dd020037c00 (size 96):
>>    comm "systemd-udevd", pid 435, jiffies 4294892550 (age 8909.356s)
>>    hex dump (first 32 bytes):
>>      5d 8e 4e b9 ff ff ff ff 00 00 00 00 00 00 00 00 ].N.............
>>      00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
>>    backtrace:
>>      [<ffffffffb81a74be>] __kmem_cache_alloc_node+0x22e/0x2b0
>>      [<ffffffffb8127b6e>] kmalloc_trace+0x2e/0xa0
>>      [<ffffffffb87543d9>] class_create+0x29/0x80
>>      [<ffffffffb8880d24>] usb_register_dev+0x1d4/0x2e0
> 
> As the call to class_create() in this path is now gone in 6.4-rc1, can
> you retry that release to see if this is still there or not?

Certainly, but probably not before 6 PM UTC+02.

Best regards,
Mirsad

-- 
Mirsad Goran Todorovac
Sistem inženjer
Grafički fakultet | Akademija likovnih umjetnosti
Sveučilište u Zagrebu

System engineer
Faculty of Graphic Arts | Academy of Fine Arts
University of Zagreb, Republic of Croatia

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