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

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Date:   Mon, 10 Jan 2022 15:11:43 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     lgirdwood@...il.com, broonie@...nel.org, perex@...ex.cz,
        tiwai@...e.com, srinivas.kandagatla@...aro.org,
        colin.king@...onical.com, sashal@...nel.org,
        guennadi.liakhovetski@...ux.intel.com, wanjiabing@...o.com,
        pierre-louis.bossart@...ux.intel.com
Cc:     alsa-devel@...a-project.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH] ASoC: codecs: lpass-rx-macro: Check for error pointer after calling devm_regmap_init_mmio

The devm_regmap_init_mmio() may return error pointer under certain
circumstances, for example the possible failure of the kzalloc() in
regmap_mmio_gen_context(), which is called by devm_regmap_init_mmio().
Then the rx->regmap will be error pointer and be used in
rx_macro_mclk_enable().
Therefore, it should be better to check it in order to avoid the
dereference of the error pointer.

Fixes: af3d54b99764 ("ASoC: codecs: lpass-rx-macro: add support for lpass rx macro")
Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
 sound/soc/codecs/lpass-rx-macro.c | 2 ++
 1 file changed, 2 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);
 
-- 
2.25.1