[PATCH v4 3/8] iio: core: NULLify private pointer when there is no private data

[Andy Shevchenko]

In iio_device_alloc() when size of the private data is 0,
the private pointer is calculated to behind the valid data.
NULLify it for good.

Fixes: 6d4ebd565d15 ("iio: core: wrap IIO device into an iio_dev_opaque object")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
---
 drivers/iio/industrialio-core.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 4302093b92c7..bd305fa87093 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1654,8 +1654,12 @@ struct iio_dev *iio_device_alloc(struct device *parent, int sizeof_priv)
 		return NULL;
 
 	indio_dev = &iio_dev_opaque->indio_dev;
-	indio_dev->priv = (char *)iio_dev_opaque +
-		ALIGN(sizeof(struct iio_dev_opaque), IIO_DMA_MINALIGN);
+
+	if (sizeof_priv)
+		indio_dev->priv = (char *)iio_dev_opaque +
+			ALIGN(sizeof(struct iio_dev_opaque), IIO_DMA_MINALIGN);
+	else
+		indio_dev->priv = NULL;
 
 	indio_dev->dev.parent = parent;
 	indio_dev->dev.type = &iio_device_type;
-- 
2.43.0.rc1.1.gbec44491f096