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

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: Artemii Karasev <karasev@ispras.ru>
Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20230207132026.2870-1-karasev@ispras.ru
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/synth/emux/emux_nrpn.c b/sound/synth/emux/emux_nrpn.c
index 8056422..0d6b82a 100644 (file)
--- a/sound/synth/emux/emux_nrpn.c
+++ b/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],