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iio: light: vcnl4000: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

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[ Upstream commit dce793c0ab00c35039028fdcd5ce123805a01361 ]

Add __aligned(8) to ensure the buffer passed to
iio_push_to_buffers_with_timestamp() is suitable for the naturally
aligned timestamp that will be inserted.

Here an explicit structure is not used, because the holes would
necessitate the addition of an explict memset(), to avoid a kernel
data leak, making for a less minimal fix.

Found during an audit of all callers of iio_push_to_buffers_with_timestamp()

Fixes: 8fe78d5261 ("iio: vcnl4000: Add buffer support for VCNL4010/20.")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Mathieu Othacehe <m.othacehe@gmail.com>
Reviewed-by: Nuno Sá <nuno.sa@analog.com>
Link: https://lore.kernel.org/r/20210613152301.571002-7-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jonathan Cameron 2021-06-13 16:22:59 +01:00 committed by Greg Kroah-Hartman
parent 8c85c0f8cb
commit 9cf11dca57
1 changed files with 1 additions and 1 deletions
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drivers/iio/light/vcnl4000.c
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@ -910,7 +910,7 @@ static irqreturn_t vcnl4010_trigger_handler(int irq, void *p)
struct iio_dev *indio_dev = pf->indio_dev;
struct vcnl4000_data *data = iio_priv(indio_dev);
const unsigned long *active_scan_mask = indio_dev->active_scan_mask;
u16 buffer[8] = {0}; /* 1x16-bit + ts */
u16 buffer[8] __aligned(8) = {0}; /* 1x16-bit + naturally aligned ts */
bool data_read = false;
unsigned long isr;
int val = 0;