[PATCH 2/2] ASoC: ops: Check bounds for second channel in snd_soc_put_volsw_sx()

[Mark Brown <broonie@kernel.org>]

The bounds checks in snd_soc_put_volsw_sx() are only being applied to the
first channel, meaning it is possible to write out of bounds values to the
second channel in stereo controls. Add appropriate checks.

Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/soc-ops.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/sound/soc/soc-ops.c b/sound/soc/soc-ops.c
index 1ac7e2ce31a1..7cac26a64e0c 100644
--- a/sound/soc/soc-ops.c
+++ b/sound/soc/soc-ops.c
@@ -451,6 +451,12 @@ int snd_soc_put_volsw_sx(struct snd_kcontrol *kcontrol,
 
 		val_mask = mask << rshift;
 		val2 = (ucontrol->value.integer.value[1] + min) & mask;
+
+		if (mc->platform_max && val2 > mc->platform_max)
+			return -EINVAL;
+		if (val2 > max)
+			return -EINVAL;
+
 		val2 = val2 << rshift;
 
 		err = snd_soc_component_update_bits(component, reg2, val_mask,
-- 
2.30.2