ASoC: meson: g12a-tohdmitx: Validate written enum values

[ Upstream commit 1e001206804be3f3d21f4a1cf16e5d059d75643f ]

When writing to an enum we need to verify that the value written is valid
for the enumeration, the helper function snd_soc_item_enum_to_val() doesn't
do it since it needs to return an unsigned (and in any case we'd need to
check the return value).

Fixes: c8609f3870f7 ("ASoC: meson: add g12a tohdmitx control")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240103-meson-enum-val-v1-2-424af7a8fb91@kernel.org
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/sound/soc/meson/g12a-tohdmitx.c b/sound/soc/meson/g12a-tohdmitx.c
index f7ef9aa..51b7703 100644 (file)
--- a/sound/soc/meson/g12a-tohdmitx.c
+++ b/sound/soc/meson/g12a-tohdmitx.c
@@ -45,6 +45,9 @@ static int g12a_tohdmitx_i2s_mux_put_enum(struct snd_kcontrol *kcontrol,
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int mux, changed;
 
+       if (ucontrol->value.enumerated.item[0] >= e->items)
+               return -EINVAL;
+
        mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
        changed = snd_soc_component_test_bits(component, e->reg,
                                              CTRL0_I2S_DAT_SEL,
@@ -93,6 +96,9 @@ static int g12a_tohdmitx_spdif_mux_put_enum(struct snd_kcontrol *kcontrol,
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int mux, changed;
 
+       if (ucontrol->value.enumerated.item[0] >= e->items)
+               return -EINVAL;
+
        mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
        changed = snd_soc_component_test_bits(component, TOHDMITX_CTRL0,
                                              CTRL0_SPDIF_SEL,