linux-kernel - [PATCH 5.18 201/231] ASoC: rt711-sdca: fix kernel NULL pointer dereference when IO error

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Message-Id: <20220719114730.926631192@linuxfoundation.org>
Date:   Tue, 19 Jul 2022 13:54:46 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shuming Fan <shumingf@...ltek.com>,
        Mark Brown <broonie@...nel.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 201/231] ASoC: rt711-sdca: fix kernel NULL pointer dereference when IO error

From: Shuming Fan <shumingf@...ltek.com>

[ Upstream commit 1df793d479bef546569fc2e409ff8bb3f0fb8e99 ]

The initial settings will be written before the codec probe function.
But, the rt711->component doesn't be assigned yet.
If IO error happened during initial settings operations, it will cause the kernel panic.
This patch changed component->dev to slave->dev to fix this issue.

Signed-off-by: Shuming Fan <shumingf@...ltek.com>
Link: https://lore.kernel.org/r/20220621090719.30558-1-shumingf@realtek.com
Signed-off-by: Mark Brown <broonie@...nel.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 sound/soc/codecs/rt711-sdca.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/sound/soc/codecs/rt711-sdca.c b/sound/soc/codecs/rt711-sdca.c
index dfe3c9299ebd..5ad53bbc8528 100644
--- a/sound/soc/codecs/rt711-sdca.c
+++ b/sound/soc/codecs/rt711-sdca.c
@@ -34,7 +34,7 @@ static int rt711_sdca_index_write(struct rt711_sdca_priv *rt711,
 
 	ret = regmap_write(regmap, addr, value);
 	if (ret < 0)
-		dev_err(rt711->component->dev,
+		dev_err(&rt711->slave->dev,
 			"Failed to set private value: %06x <= %04x ret=%d\n",
 			addr, value, ret);
 
@@ -50,7 +50,7 @@ static int rt711_sdca_index_read(struct rt711_sdca_priv *rt711,
 
 	ret = regmap_read(regmap, addr, value);
 	if (ret < 0)
-		dev_err(rt711->component->dev,
+		dev_err(&rt711->slave->dev,
 			"Failed to get private value: %06x => %04x ret=%d\n",
 			addr, *value, ret);
 
-- 
2.35.1