[PATCH v3 10/12] ASoC: mediatek: mt8189: Validate sysclk frequency

[phucduc.bui at gmail.com]

From: bui duc phuc <phucduc.bui at gmail.com>

A zero frequency causes a modulo-by-zero error when validating the
I2S clock frequency. Reject it before performing the validation.

Fixes: 7eb153585598 ("ASoC: mediatek: mt8189: add platform driver")
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno at collabora.com>
Signed-off-by: bui duc phuc <phucduc.bui at gmail.com>
---

Changes in v2:
 - Check for zero frequency since freq is unsigned. 
Changes in v3:
 - Add Angelo's Reviewed-by tag.

 sound/soc/mediatek/mt8189/mt8189-dai-i2s.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/sound/soc/mediatek/mt8189/mt8189-dai-i2s.c b/sound/soc/mediatek/mt8189/mt8189-dai-i2s.c
index 8cd5ddf62d46..c9e80ef42f60 100644
--- a/sound/soc/mediatek/mt8189/mt8189-dai-i2s.c
+++ b/sound/soc/mediatek/mt8189/mt8189-dai-i2s.c
@@ -1287,6 +1287,9 @@ static int mtk_dai_i2s_set_sysclk(struct snd_soc_dai *dai,
 	    dir != SND_SOC_CLOCK_OUT)
 		return -EINVAL;
 
+	if (!freq)
+		return -EINVAL;
+
 	i2s_priv = afe_priv->dai_priv[dai->id];
 	if (!i2s_priv)
 		return -EINVAL;
-- 
2.43.0