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ALSA: usb-audio: Drop snd_BUG_ON() from snd_usbmidi_output_open()

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commit ad72c3c3f6 upstream.

snd_usbmidi_output_open() has a check of the NULL port with
snd_BUG_ON().  snd_BUG_ON() was used as this shouldn't have happened,
but in reality, the NULL port may be seen when the device gives an
invalid endpoint setup at the descriptor, hence the driver skips the
allocation.  That is, the check itself is valid and snd_BUG_ON()
should be dropped from there.  Otherwise it's confusing as if it were
a real bug, as recently syzbot stumbled on it.

Reported-by: syzbot+9abda841d636d86c41da@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/syzbot+9abda841d636d86c41da@syzkaller.appspotmail.com
Link: https://lore.kernel.org/r/20221112141223.6144-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2022-11-12 15:12:23 +01:00 committed by Greg Kroah-Hartman
parent 72c2ea34fa
commit e7dc436aea
1 changed files with 1 additions and 3 deletions
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4
sound/usb/midi.c
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@ -1149,10 +1149,8 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
port = &umidi->endpoints[i].out->ports[j];
break;
}
if (!port) {
snd_BUG();
if (!port)
return -ENXIO;
}
substream->runtime->private_data = port;
port->state = STATE_UNKNOWN;