From: Takashi Iwai <tiwai@suse.de>
To: alsa-devel@alsa-project.org
Subject: [PATCH] ALSA: usb-audio: Cancel pending work at closing a MIDI substream
Date: Wed, 25 May 2022 15:12:03 +0200 [thread overview]
Message-ID: <20220525131203.11299-1-tiwai@suse.de> (raw)
At closing a USB MIDI output substream, there might be still a pending
work, which would eventually access the rawmidi runtime object that is
being released. For fixing the race, make sure to cancel the pending
work at closing.
Reported-by: syzbot+6912c9592caca7ca0e7d@syzkaller.appspotmail.com
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/000000000000e7e75005dfd07cf6@google.com
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
sound/usb/midi.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/sound/usb/midi.c b/sound/usb/midi.c
index 7c6ca2b433a5..344fbeadf161 100644
--- a/sound/usb/midi.c
+++ b/sound/usb/midi.c
@@ -1145,6 +1145,9 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
{
+ struct usbmidi_out_port *port = substream->runtime->private_data;
+
+ cancel_work_sync(&port->ep->work);
return substream_open(substream, 0, 0);
}
--
2.35.3
reply other threads:[~2022-05-25 13:13 UTC|newest]
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