[PATCH] staging: iio: ad9832:

Christophe JAILLET
2016-11-19T11:08:34Z

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@wanadoo.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