[PATCH 6.6.y] ASoC: tas2562: Validate values for volume writes

[Sasha Levin <sashal@kernel.org>]

From: Mark Brown <broonie@kernel.org>

[ Upstream commit 8fb41964f7e4e4207c8999af2056894caa7a252a ]

tas2562_volume_control_put() does not do any validation of the control
value written by userspace, it uses it to look up a value in a fixed
size array which can easily be overflowed and then writes whatever value
it gets back to the device.  Add validation that we are loading a value
we have in the array.

Cc: stable@vger.kernel.org
Reviewed-by: Cezary Rojewski <cezary.rojewski@intel.com>
Link: https://patch.msgid.link/20260715-asoc-tas2562-put-retval-v1-1-97bf467c924e@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 sound/soc/codecs/tas2562.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/tas2562.c b/sound/soc/codecs/tas2562.c
index a1cb2d723ea57..ae351bb3c66f8 100644
--- a/sound/soc/codecs/tas2562.c
+++ b/sound/soc/codecs/tas2562.c
@@ -473,10 +473,15 @@ static int tas2562_volume_control_put(struct snd_kcontrol *kcontrol,
 {
 	struct snd_soc_component *component = snd_soc_kcontrol_component(kcontrol);
 	struct tas2562_data *tas2562 = snd_soc_component_get_drvdata(component);
-	int ret;
+	int ret, index;
 	u32 reg_val;
 
-	reg_val = float_vol_db_lookup[ucontrol->value.integer.value[0]/2];
+	index = ucontrol->value.integer.value[0] / 2;
+	if (index < 0 || index >= ARRAY_SIZE(float_vol_db_lookup))
+		return -EINVAL;
+
+	reg_val = float_vol_db_lookup[index];
+
 	/*
 	 * The device applies the 32-bit coefficient to the playback path on
 	 * the write to DVC_CFG4 (the LSB, book 0 page 2 reg 0x0F), so the
-- 
2.53.0