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Message-ID: <2023050854-collage-dreamt-660c@gregkh>
Date: Mon, 8 May 2023 16:01:12 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: 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 Mon, May 08, 2023 at 08:51:55AM +0200, 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?
No, wait, it's still there, I was looking at a development branch of
mine that isn't sent upstream yet. And syzbot just reported the same
thing:
https://lore.kernel.org/r/00000000000058d15f05fb264013@google.com
So something's wrong here, let me dig into it tomorrow when I get a
chance...
thanks,
greg k-h
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