From:   Jiasheng Jiang <jiasheng@iscas.ac.cn>
To:     lgirdwood@gmail.com, broonie@kernel.org, perex@perex.cz,
        tiwai@suse.com, srinivas.kandagatla@linaro.org,
        colin.king@canonical.com, sashal@kernel.org,
        guennadi.liakhovetski@linux.intel.com, wanjiabing@vivo.com,
        pierre-louis.bossart@linux.intel.com
Cc:     alsa-devel@alsa-project.org, linux-kernel@vger.kernel.org,
        Jiasheng Jiang <jiasheng@iscas.ac.cn>
Subject: [PATCH] ASoC: codecs: lpass-rx-macro: Check for error pointer after calling devm_regmap_init_mmio
Date:   Mon, 10 Jan 2022 15:11:43 +0800
Message-Id: <20220110071143.28984-1-jiasheng@iscas.ac.cn>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

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@iscas.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