linux-kernel - [PATCH 2/3] ASoC: rt5514: Avoid relying on uninitialized "val" value

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Date:   Fri, 14 Apr 2017 09:40:31 -0700
From:   Douglas Anderson <dianders@...omium.org>
To:     bardliao@...ltek.com, oder_chiou@...ltek.com
Cc:     Douglas Anderson <dianders@...omium.org>, lgirdwood@...il.com,
        broonie@...nel.org, perex@...ex.cz, tiwai@...e.com,
        alsa-devel@...a-project.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] ASoC: rt5514: Avoid relying on uninitialized "val" value

In rt5514_i2c_probe() if the regmap_read(RT5514_VENDOR_ID2) fails then
"val" may be left as uninitialized.  Current code relies on "val" not
being RT5514_DEVICE_ID, but that's potentially unsafe.

Let's check for errors from regmap_read() and also explicitly init the
value do we're not passing a possibly uninitialized int to printk.

Signed-off-by: Douglas Anderson <dianders@...omium.org>
---
 sound/soc/codecs/rt5514.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/codecs/rt5514.c b/sound/soc/codecs/rt5514.c
index 481e77763fe4..969a05620e04 100644
--- a/sound/soc/codecs/rt5514.c
+++ b/sound/soc/codecs/rt5514.c
@@ -1090,7 +1090,7 @@ static int rt5514_i2c_probe(struct i2c_client *i2c,
 	struct rt5514_platform_data *pdata = dev_get_platdata(&i2c->dev);
 	struct rt5514_priv *rt5514;
 	int ret;
-	unsigned int val;
+	unsigned int val = ~0;
 
 	rt5514 = devm_kzalloc(&i2c->dev, sizeof(struct rt5514_priv),
 				GFP_KERNEL);
@@ -1120,8 +1120,8 @@ static int rt5514_i2c_probe(struct i2c_client *i2c,
 		return ret;
 	}
 
-	regmap_read(rt5514->regmap, RT5514_VENDOR_ID2, &val);
-	if (val != RT5514_DEVICE_ID) {
+	ret = regmap_read(rt5514->regmap, RT5514_VENDOR_ID2, &val);
+	if (ret || val != RT5514_DEVICE_ID) {
 		dev_err(&i2c->dev,
 			"Device with ID register %x is not rt5514\n", val);
 		return -ENODEV;
-- 
2.12.2.762.g0e3151a226-goog