From ac66b222d167f6f6a85f0d8b2e45ee028847b136 Mon Sep 17 00:00:00 2001 From: Takashi Iwai Date: Fri, 29 Nov 2024 10:45:42 +0100 Subject: [PATCH] ALSA: ump: Don't open legacy substream for an inactive group BugLink: https://bugs.launchpad.net/bugs/2106632 [ Upstream commit 3978d53df7236f0a517c2abeb43ddf6ac162cdd8 ] 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 Signed-off-by: Sasha Levin Signed-off-by: Manuel Diewald Signed-off-by: Mehmet Basaran --- sound/core/ump.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/sound/core/ump.c b/sound/core/ump.c index 8dce90ce34ba..32d27e58416a 100644 --- a/sound/core/ump.c +++ b/sound/core/ump.c @@ -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,