linux-kernel - [PATCH v2] ASoC: codecs: Check for error pointer after calling devm_regmap_init

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Date:   Fri, 14 Jan 2022 14:57:13 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     broonie@...nel.org
Cc:     cezary.rojewski@...el.com, srinivas.kandagatla@...aro.org,
        bgoswami@...eaurora.org, lgirdwood@...il.com, perex@...ex.cz,
        tiwai@...e.com, alsa-devel@...a-project.org,
        linux-kernel@...r.kernel.org, Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v2] ASoC: codecs: Check for error pointer after calling devm_regmap_init_mmio

Since the possible failure of the devm_regmap_init_mmio(), it will
return error pointer and be assigned to the regmap.
Then the error pointer will be dereferenced.
For example rx->regmap will be used in rx_macro_mclk_enable().
Therefore, it should be better to check it.

Fixes: af3d54b99764 ("ASoC: codecs: lpass-rx-macro: add support for lpass rx macro")
Fixes: c39667ddcfc5 ("ASoC: codecs: lpass-tx-macro: add support for lpass tx macro")
Fixes: 809bcbcecebf ("ASoC: codecs: lpass-wsa-macro: Add support to WSA Macro")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog

v1 -> v2

* Change 1. Refine the commit message.
---
 sound/soc/codecs/lpass-rx-macro.c  | 2 ++
 sound/soc/codecs/lpass-tx-macro.c  | 2 ++
 sound/soc/codecs/lpass-wsa-macro.c | 2 ++
 3 files changed, 6 insertions(+)

diff --git a/sound/soc/codecs/lpass-rx-macro.c b/sound/soc/codecs/lpass-rx-macro.c
index 07894ec5e7a6..2adbf2e2697f 100644
--- a/sound/soc/codecs/lpass-rx-macro.c
+++ b/sound/soc/codecs/lpass-rx-macro.c
@@ -3542,6 +3542,8 @@ static int rx_macro_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	rx->regmap = devm_regmap_init_mmio(dev, base, &rx_regmap_config);
+	if (IS_ERR(rx->regmap))
+		return PTR_ERR(rx->regmap);
 
 	dev_set_drvdata(dev, rx);
 
diff --git a/sound/soc/codecs/lpass-tx-macro.c b/sound/soc/codecs/lpass-tx-macro.c
index 27a0d5defd27..e4bbc6bd4925 100644
--- a/sound/soc/codecs/lpass-tx-macro.c
+++ b/sound/soc/codecs/lpass-tx-macro.c
@@ -1803,6 +1803,8 @@ static int tx_macro_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	tx->regmap = devm_regmap_init_mmio(dev, base, &tx_regmap_config);
+	if (IS_ERR(tx->regmap))
+		return PTR_ERR(tx->regmap);
 
 	dev_set_drvdata(dev, tx);
 
diff --git a/sound/soc/codecs/lpass-wsa-macro.c b/sound/soc/codecs/lpass-wsa-macro.c
index d3ac318fd6b6..dd1a8b7bc794 100644
--- a/sound/soc/codecs/lpass-wsa-macro.c
+++ b/sound/soc/codecs/lpass-wsa-macro.c
@@ -2405,6 +2405,8 @@ static int wsa_macro_probe(struct platform_device *pdev)
 		return PTR_ERR(base);
 
 	wsa->regmap = devm_regmap_init_mmio(dev, base, &wsa_regmap_config);
+	if (IS_ERR(wsa->regmap))
+		return PTR_ERR(wsa->regmap);
 
 	dev_set_drvdata(dev, wsa);
 
-- 
2.25.1