6.6-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxx>
Reviewed-by: David Lechner <dlechner@xxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20240304140650.977784-2-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/iio/industrialio-core.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index feec93adb0651..5e1a85ca12119 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -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;
--
2.43.0
