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iio: core: Leave private pointer NULL when no private data supplied

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[ Upstream commit f0245ab389330cbc1d187e358a5b890d9f5383db ]

In iio_device_alloc() when size of the private data is 0,
the private pointer is calculated to point behind the valid data.
Leave it NULL when no private data supplied.

Fixes: 6d4ebd565d15 ("iio: core: wrap IIO device into an iio_dev_opaque object")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: David Lechner <dlechner@baylibre.com>
Link: https://lore.kernel.org/r/20240304140650.977784-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Andy Shevchenko 2024-03-04 16:04:32 +02:00 committed by Greg Kroah-Hartman
parent 5c53a28ab2
commit fe92a949b2
1 changed files with 4 additions and 2 deletions
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6
drivers/iio/industrialio-core.c
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@ -1649,8 +1649,10 @@ 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(*iio_dev_opaque), IIO_DMA_MINALIGN);
indio_dev->dev.parent = parent;
indio_dev->dev.type = &iio_device_type;