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ALSA: ump: Don't open legacy substream for an inactive group

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When a UMP Group is inactive, we shouldn't allow users to access it
via the legacy MIDI access.  Add the group active flag check and
return -ENODEV if it's inactive.

Link: https://patch.msgid.link/20241129094546.32119-2-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2024-11-29 10:45:42 +01:00
parent aaa55faa24
commit 3978d53df7
1 changed files with 2 additions and 0 deletions
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2
sound/core/ump.c
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@ -1087,6 +1087,8 @@ static int snd_ump_legacy_open(struct snd_rawmidi_substream *substream)
guard(mutex)(&ump->open_mutex);
if (ump->legacy_substreams[dir][group])
return -EBUSY;
if (!ump->groups[group].active)
return -ENODEV;
if (dir == SNDRV_RAWMIDI_STREAM_OUTPUT) {
if (!ump->legacy_out_opens) {
err = snd_rawmidi_kernel_open(&ump->core, 0,