[PATCH AUTOSEL 6.6 57/83] ALSA: vmaster: Return error for invalid input values

[Sasha Levin]

From: Takashi Iwai <tiwai@xxxxxxx>

[ Upstream commit 10457f5042b4890a667e2f15a2e783490dda44d2 ]

So far the vmaster code has been tolerant about the input values and
accepts any values by correcting internally.  But now our own selftest
starts complaining about this behavior, so let's be picky and change
the behavior to return -EINVAL for invalid input values instead.

Reported-by: Paul Menzel <pmenzel@xxxxxxxxxxxxx>
Closes: https://lore.kernel.org/r/1d44be36-9bb9-4d82-8953-5ae2a4f09405@xxxxxxxxxxxxx
Reviewed-by: Jaroslav Kysela <perex@xxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Link: https://lore.kernel.org/20240616073454.16512-2-tiwai@xxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 sound/core/vmaster.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c
index 378d2c7c3d4af..4bc084b686d83 100644
--- a/sound/core/vmaster.c
+++ b/sound/core/vmaster.c
@@ -204,6 +204,12 @@ static int follower_put(struct snd_kcontrol *kcontrol,
 	err = follower_init(follower);
 	if (err < 0)
 		return err;
+	for (ch = 0; ch < follower->info.count; ch++) {
+		if (ucontrol->value.integer.value[ch] < follower->info.min_val ||
+		    ucontrol->value.integer.value[ch] > follower->info.max_val)
+			return -EINVAL;
+	}
+
 	for (ch = 0; ch < follower->info.count; ch++) {
 		if (follower->vals[ch] != ucontrol->value.integer.value[ch]) {
 			changed = 1;
@@ -372,6 +378,8 @@ static int master_put(struct snd_kcontrol *kcontrol,
 	new_val = ucontrol->value.integer.value[0];
 	if (new_val == old_val)
 		return 0;
+	if (new_val < master->info.min_val || new_val > master->info.max_val)
+		return -EINVAL;
 
 	err = sync_followers(master, old_val, new_val);
 	if (err < 0)
-- 
2.43.0