[PATCH] ASoC: mediatek: mt8365: check suspend backup allocation

[Ruoyu Wang]

mt8365_afe_suspend() lazily allocates the register backup array and then
stores register values into it. If devm_kcalloc() fails, the suspend path
dereferences afe->reg_back_up in the backup loop.

Check the allocation result before using the array. Disable the main
clock before returning so the error path balances the clock enable at the
start of suspend.

Signed-off-by: Ruoyu Wang <ruoyuw560 at gmail.com>
---
 sound/soc/mediatek/mt8365/mt8365-afe-pcm.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c b/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c
index d01793394f225..74e4f53b31605 100644
--- a/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c
+++ b/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c
@@ -1978,6 +1978,10 @@ static int mt8365_afe_suspend(struct device *dev)
 		afe->reg_back_up =
 			devm_kcalloc(dev, afe->reg_back_up_list_num,
 				     sizeof(unsigned int), GFP_KERNEL);
+	if (!afe->reg_back_up) {
+		mt8365_afe_disable_main_clk(afe);
+		return -ENOMEM;
+	}
 
 	for (i = 0; i < afe->reg_back_up_list_num; i++)
 		regmap_read(regmap, afe->reg_back_up_list[i],
-- 
2.34.1