ALSA: emux: Avoid potential array out-of-bound in snd_emux_xg_control()

stable inclusion
from stable-v5.10.168
commit e1646e2be9561469ff26c11295ad14b6c32e670f
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7URR4

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=e1646e2be9561469ff26c11295ad14b6c32e670f

----------------------------------------------------

commit 6a32425f upstream.

snd_emux_xg_control() can be called with an argument 'param' greater
than size of 'control' array. It may lead to accessing 'control'
array at a wrong index.

Found by Linux Verification Center (linuxtesting.org) with SVACE.
Signed-off-by: NArtemii Karasev <karasev@ispras.ru>
Fixes: 1da177e4 ("Linux-2.6.12-rc2")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20230207132026.2870-1-karasev@ispras.ruSigned-off-by: NTakashi Iwai <tiwai@suse.de>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Nzhaoxiaoqiang11 <zhaoxiaoqiang11@jd.com>

sound/synth/emux/emux_nrpn.c

@@ -349,6 +349,9 @@ int
 snd_emux_xg_control(struct snd_emux_port *port, struct snd_midi_channel *chan,
 		    int param)
 {
+	if (param >= ARRAY_SIZE(chan->control))
+		return -EINVAL;
+
 	return send_converted_effect(xg_effects, ARRAY_SIZE(xg_effects),
 				     port, chan, param,
 				     chan->control[param],