[PATCH 5.10 063/252] iio: adc: ad7768-1: Fix too small buffer passed to iio_push_to_buffers_with_timestamp()

From: Greg Kroah-Hartman
Date: Mon May 31 2021 - 10:26:17 EST


From: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>

commit a1caeebab07e9d72eec534489f47964782b93ba9 upstream.

Add space for the timestamp to be inserted. Also ensure correct
alignment for passing to iio_push_to_buffers_with_timestamp()

Fixes: a5f8c7da3dbe ("iio: adc: Add AD7768-1 ADC basic support")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Reviewed-by: Andy Shevchenko <andy.shevchenko@xxxxxxxxx>
Link: https://lore.kernel.org/r/20210501165314.511954-2-jic23@xxxxxxxxxx
Cc: <Stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/iio/adc/ad7768-1.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/iio/adc/ad7768-1.c
+++ b/drivers/iio/adc/ad7768-1.c
@@ -166,6 +166,10 @@ struct ad7768_state {
* transfer buffers to live in their own cache lines.
*/
union {
+ struct {
+ __be32 chan;
+ s64 timestamp;
+ } scan;
__be32 d32;
u8 d8[2];
} data ____cacheline_aligned;
@@ -459,11 +463,11 @@ static irqreturn_t ad7768_trigger_handle

mutex_lock(&st->lock);

- ret = spi_read(st->spi, &st->data.d32, 3);
+ ret = spi_read(st->spi, &st->data.scan.chan, 3);
if (ret < 0)
goto err_unlock;

- iio_push_to_buffers_with_timestamp(indio_dev, &st->data.d32,
+ iio_push_to_buffers_with_timestamp(indio_dev, &st->data.scan,
iio_get_time_ns(indio_dev));

iio_trigger_notify_done(indio_dev->trig);