ALSA: usb-audio: Cancel pending work at closing a MIDI substream
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 Link: https://lore.kernel.org/r/20220525131203.11299-1-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -1145,6 +1145,9 @@ static int snd_usbmidi_output_open(struct snd_rawmidi_substream *substream)
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static int snd_usbmidi_output_close(struct snd_rawmidi_substream *substream)
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{
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struct usbmidi_out_port *port = substream->runtime->private_data;
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cancel_work_sync(&port->ep->work);
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return substream_open(substream, 0, 0);
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}
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