linux-kernel - [PATCH 5.7 06/24] iio:chemical:sps30: Fix timestamp alignment

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Message-Id: <20200609174149.832597490@linuxfoundation.org>
Date:   Tue,  9 Jun 2020 19:45:37 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Lars-Peter Clausen <lars@...afoo.de>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Stable@...r.kernel.org,
        Tomasz Duszynski <tomasz.duszynski@...akon.com>
Subject: [PATCH 5.7 06/24] iio:chemical:sps30: Fix timestamp alignment

From: Jonathan Cameron <Jonathan.Cameron@...wei.com>

commit a5bf6fdd19c327bcfd9073a8740fa19ca4525fd4 upstream.

One of a class of bugs pointed out by Lars in a recent review.
iio_push_to_buffers_with_timestamp assumes the buffer used is aligned
to the size of the timestamp (8 bytes).  This is not guaranteed in
this driver which uses an array of smaller elements on the stack.

Fixes: 232e0f6ddeae ("iio: chemical: add support for Sensirion SPS30 sensor")
Reported-by: Lars-Peter Clausen <lars@...afoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: <Stable@...r.kernel.org>
Acked-by: Tomasz Duszynski <tomasz.duszynski@...akon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/iio/chemical/sps30.c |    9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

--- a/drivers/iio/chemical/sps30.c
+++ b/drivers/iio/chemical/sps30.c
@@ -230,15 +230,18 @@ static irqreturn_t sps30_trigger_handler
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct sps30_state *state = iio_priv(indio_dev);
 	int ret;
-	s32 data[4 + 2]; /* PM1, PM2P5, PM4, PM10, timestamp */
+	struct {
+		s32 data[4]; /* PM1, PM2P5, PM4, PM10 */
+		s64 ts;
+	} scan;
 
 	mutex_lock(&state->lock);
-	ret = sps30_do_meas(state, data, 4);
+	ret = sps30_do_meas(state, scan.data, ARRAY_SIZE(scan.data));
 	mutex_unlock(&state->lock);
 	if (ret)
 		goto err;
 
-	iio_push_to_buffers_with_timestamp(indio_dev, data,
+	iio_push_to_buffers_with_timestamp(indio_dev, &scan,
 					   iio_get_time_ns(indio_dev));
 err:
 	iio_trigger_notify_done(indio_dev->trig);