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

[ Upstream commit 3150b70e944ead909260285dfb5707d0bedcf87b ]

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: af2618a2eee8 ("ASoC: meson: g12a: add internal DAC glue driver")
Signed-off-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240103-meson-enum-val-v1-1-424af7a8fb91@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-toacodec.c b/sound/soc/meson/g12a-toacodec.c
index 6c45037..dd7f07d 100644 (file)
--- a/sound/soc/meson/g12a-toacodec.c
+++ b/sound/soc/meson/g12a-toacodec.c
@@ -71,6 +71,9 @@ static int g12a_toacodec_mux_put_enum(struct snd_kcontrol *kcontrol,
        struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
        unsigned int mux, reg;
 
+       if (ucontrol->value.enumerated.item[0] >= e->items)
+               return -EINVAL;
+
        mux = snd_soc_enum_item_to_val(e, ucontrol->value.enumerated.item[0]);
        regmap_field_read(priv->field_dat_sel, &reg);