linux-kernel - Re: [BUG] ALSA: echoaudio: warning when the driver fails to probe

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Date:   Mon, 11 Apr 2022 16:49:53 +0800
From:   Zheyu Ma <zheyuma97@...il.com>
To:     Takashi Iwai <tiwai@...e.de>
Cc:     perex@...ex.cz, tiwai@...e.com, alsa-devel@...a-project.org,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [BUG] ALSA: echoaudio: warning when the driver fails to probe

On Mon, Apr 11, 2022 at 3:41 PM Takashi Iwai <tiwai@...e.de> wrote:
>
> On Sun, 10 Apr 2022 11:13:55 +0200,
> Zheyu Ma wrote:
> >
> > Hello,
> >
> > I found a bug in echoaudio.c.
> > When the driver fails at the function snd_echo_create(), it should
> > release resources requested before, otherwise we will get the
> > following warning:
> >
> > [    3.262866] remove_proc_entry: removing non-empty directory
> > 'irq/21', leaking at least 'snd_indigodj'
> > [    3.263577] WARNING: CPU: 3 PID: 261 at fs/proc/generic.c:717
> > remove_proc_entry+0x389/0x3f0
> > [    3.267098] RIP: 0010:remove_proc_entry+0x389/0x3f0
> > [    3.269976] Call Trace:
> > [    3.269979]  <TASK>
> > [    3.269988]  unregister_irq_proc+0x14c/0x170
> > [    3.269997]  irq_free_descs+0x94/0xe0
> > [    3.270004]  mp_unmap_irq+0xb6/0x100
> > [    3.270011]  acpi_unregister_gsi_ioapic+0x27/0x40
> > [    3.270017]  acpi_pci_irq_disable+0x1d3/0x320
> > [    3.270025]  pci_disable_device+0x1ad/0x380
> > [    3.270034]  pcim_release+0x566/0x6d0
> > [    3.270046]  devres_release_all+0x1f1/0x2c0
> > [    3.270057]  really_probe+0xe0/0x920
>
> Could you try the patch below?

The following patch works for me, the previous warning disappears, thank you.
But I got another error, I have no idea about it.

[    3.326686] snd_indigodj 0000:00:05.0: Direct firmware load for
ea/indigo_dj_dsp.fw failed with error -2
[    3.327474] snd_indigodj 0000:00:05.0: get_firmware(): Firmware not
available (-2)
[    3.328077] snd_indigodj 0000:00:05.0: init_hw err=-2
[    3.328496] snd_indigodj: probe of 0000:00:05.0 failed with error -2
[    3.329965] ==================================================================
[    3.330525] BUG: KASAN: use-after-free in stop_transport+0xa5/0x4c0
[snd_indigodj]
[    3.331122] Read of size 4 at addr ffff88800943f010 by task systemd-udevd/255
[    3.333226] Call Trace:
[    3.333426]  <TASK>
[    3.333595]  dump_stack_lvl+0x5a/0x74
[    3.333888]  print_address_description+0x7b/0x440
[    3.334264]  print_report+0x101/0x200
[    3.334558]  ? _printk+0x54/0x6e
[    3.334818]  ? stop_transport+0xa5/0x4c0 [snd_indigodj]
[    3.335231]  kasan_report+0xc1/0xf0
[    3.335513]  ? stop_transport+0xa5/0x4c0 [snd_indigodj]
[    3.335938]  stop_transport+0xa5/0x4c0 [snd_indigodj]
[    3.336346]  snd_echo_free+0x8c/0x410 [snd_indigodj]
[    3.336741]  ? snd_echo_interrupt+0x4b0/0x4b0 [snd_indigodj]
[    3.337183]  release_card_device+0x7d/0x190
[    3.337519]  ? snd_power_wait+0x80/0x80
[    3.337829]  device_release+0x97/0x1c0
[    3.338127]  kobject_put+0x144/0x1c0
[    3.338417]  __snd_card_release+0xe4/0x140
[    3.338744]  devres_release_all+0x1f1/0x2c0
[    3.339079]  really_probe+0xe0/0x920

Regards,
Zheyu Ma