Add check of input value's range in fsl_easrc_iec958_put_bits(),
otherwise the wrong value may be written from user space.

Fixes: 955ac624058f ("ASoC: fsl_easrc: Add EASRC ASoC CPU DAI drivers")
Signed-off-by: Shengjiu Wang <shengjiu.wang@nxp.com>
---
 sound/soc/fsl/fsl_easrc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/fsl/fsl_easrc.c b/sound/soc/fsl/fsl_easrc.c
index 599e439b359a..f48e43a0edcf 100644
--- a/sound/soc/fsl/fsl_easrc.c
+++ b/sound/soc/fsl/fsl_easrc.c
@@ -54,6 +54,9 @@ static int fsl_easrc_iec958_put_bits(struct snd_kcontrol *kcontrol,
 	unsigned int regval = ucontrol->value.integer.value[0];
 	int ret;
 
+	if (regval < EASRC_WIDTH_16_BIT || regval > EASRC_WIDTH_24_BIT)
+		return -EINVAL;
+
 	ret = (easrc_priv->bps_iec958[mc->regbase] != regval);
 
 	easrc_priv->bps_iec958[mc->regbase] = regval;
-- 
2.34.1