linux-kernel - [PATCH] staging: iio: ad9832:

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Message-Id: <20161119110834.25025-1-christophe.jaillet@wanadoo.fr>
Date:   Sat, 19 Nov 2016 12:08:34 +0100
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     lars@...afoo.de, Michael.Hennerich@...log.com, jic23@...nel.org,
        knaack.h@....de, pmeerw@...erw.net, gregkh@...uxfoundation.org,
        eraretuya@...il.com
Cc:     linux-iio@...r.kernel.org, devel@...verdev.osuosl.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH] staging: iio: ad9832:

Commit a98461d79ba5 ("staging: iio: ad9832: add DVDD regulator") and
commit 43a07e48af44 ("staging: iio: ad9832: clean-up regulator 'reg'") add
some dereference of 'st' which is an un-initialized pointer at this point.

Re-order code and tweak error handling in order to allocate memory and have
'st' be a valid pointer before using it.

Fixes: a98461d79ba5 ("staging: iio: ad9832: add DVDD regulator")
Fixes: 43a07e48af44 ("staging: iio: ad9832: clean-up regulator 'reg'")

Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
Compile tested only
---
 drivers/staging/iio/frequency/ad9832.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c
index 639047fade30..16894836f982 100644
--- a/drivers/staging/iio/frequency/ad9832.c
+++ b/drivers/staging/iio/frequency/ad9832.c
@@ -211,6 +211,15 @@ static int ad9832_probe(struct spi_device *spi)
 		return -ENODEV;
 	}
 
+	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
+	if (!indio_dev)
+		return -ENOMEM;
+
+	spi_set_drvdata(spi, indio_dev);
+	st = iio_priv(indio_dev);
+	st->mclk = pdata->mclk;
+	st->spi = spi;
+
 	st->avdd = devm_regulator_get(&spi->dev, "avdd");
 	if (IS_ERR(st->avdd))
 		return PTR_ERR(st->avdd);
@@ -233,16 +242,6 @@ static int ad9832_probe(struct spi_device *spi)
 		goto error_disable_avdd;
 	}
 
-	indio_dev = devm_iio_device_alloc(&spi->dev, sizeof(*st));
-	if (!indio_dev) {
-		ret = -ENOMEM;
-		goto error_disable_dvdd;
-	}
-	spi_set_drvdata(spi, indio_dev);
-	st = iio_priv(indio_dev);
-	st->mclk = pdata->mclk;
-	st->spi = spi;
-
 	indio_dev->dev.parent = &spi->dev;
 	indio_dev->name = spi_get_device_id(spi)->name;
 	indio_dev->info = &ad9832_info;
-- 
2.9.3