linux-kernel - [PATCH v3] ASoC: mediatek: mt8365: Add check for devm_kcalloc() in mt8365_afe

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Message-ID: <20250923122121.1855051-1-lgs201920130244@gmail.com>
Date: Tue, 23 Sep 2025 20:21:21 +0800
From: Guangshuo Li <lgs201920130244@...il.com>
To: Liam Girdwood <lgirdwood@...il.com>,
	Mark Brown <broonie@...nel.org>,
	Jaroslav Kysela <perex@...ex.cz>,
	Takashi Iwai <tiwai@...e.com>,
	Matthias Brugger <matthias.bgg@...il.com>,
	AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
	Guangshuo Li <lgs201920130244@...il.com>,
	Charles Keepax <ckeepax@...nsource.cirrus.com>,
	Alexandre Mergnat <amergnat@...libre.com>,
	linux-sound@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-mediatek@...ts.infradead.org
Cc: stable@...r.kernel.org
Subject: [PATCH v3] ASoC: mediatek: mt8365: Add check for devm_kcalloc() in mt8365_afe_suspend()

devm_kcalloc() may fail. mt8365_afe_suspend() uses afe->reg_back_up
unconditionally after allocation and writes afe->reg_back_up[i], which
can lead to a NULL pointer dereference under low-memory conditions.

Add a NULL check and bail out with -ENOMEM, making sure to disable the
main clock before returning to keep clock state balanced.

Fixes: e1991d102bc2 ("ASoC: mediatek: mt8365: Add the AFE driver support")
Cc: stable@...r.kernel.org
Signed-off-by: Guangshuo Li <lgs201920130244@...il.com>
---
changelog:
v3:
- Move the Signed-off-by line above the '---' separator.
- Restore the original spacing/indentation in the devm_kcalloc() continuation line.
- No functional changes.

v2:
- Return -ENOMEM directly on allocation failure without goto/label.
- Disable the main clock before returning to keep clock state balanced.
---
 sound/soc/mediatek/mt8365/mt8365-afe-pcm.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c b/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c
index 10793bbe9275..570fb10c306d 100644
--- a/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c
+++ b/sound/soc/mediatek/mt8365/mt8365-afe-pcm.c
@@ -1975,11 +1975,15 @@ static int mt8365_afe_suspend(struct device *dev)
 
 	mt8365_afe_enable_main_clk(afe);
 
-	if (!afe->reg_back_up)
+	if (!afe->reg_back_up) {
 		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],
 			    &afe->reg_back_up[i]);
-- 
2.43.0