6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Takashi Iwai tiwai@suse.de
[ 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 tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- sound/core/ump.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/sound/core/ump.c b/sound/core/ump.c index ada2625ce78f..5a4a7d0b7cca 100644 --- a/sound/core/ump.c +++ b/sound/core/ump.c @@ -1081,6 +1081,8 @@ 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,