linux-kernel - [PATCH 5.12 629/700] iio: light: vcnl4035: Fix buffer alignment in iio_push_to_buffers_with

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Message-Id: <20210712061042.771365324@linuxfoundation.org>
Date:   Mon, 12 Jul 2021 08:11:52 +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,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Parthiban Nallathambi <pn@...x.de>,
        Nuno Sá <nuno.sa@...log.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.12 629/700] iio: light: vcnl4035: Fix buffer alignment in iio_push_to_buffers_with_timestamp()

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

[ Upstream commit ec90b52c07c0403a6db60d752484ec08d605ead0 ]

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 potential
kernel data leak, making for a less minimal fix.

Fixes: 55707294c4eb ("iio: light: Add support for vishay vcnl4035")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
Cc: Parthiban Nallathambi <pn@...x.de>
Reviewed-by: Nuno Sá <nuno.sa@...log.com>
Link: https://lore.kernel.org/r/20210613152301.571002-8-jic23@kernel.org
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iio/light/vcnl4035.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/light/vcnl4035.c b/drivers/iio/light/vcnl4035.c
index 73a28e30dddc..1342bbe111ed 100644
--- a/drivers/iio/light/vcnl4035.c
+++ b/drivers/iio/light/vcnl4035.c
@@ -102,7 +102,8 @@ static irqreturn_t vcnl4035_trigger_consumer_handler(int irq, void *p)
 	struct iio_poll_func *pf = p;
 	struct iio_dev *indio_dev = pf->indio_dev;
 	struct vcnl4035_data *data = iio_priv(indio_dev);
-	u8 buffer[ALIGN(sizeof(u16), sizeof(s64)) + sizeof(s64)];
+	/* Ensure naturally aligned timestamp */
+	u8 buffer[ALIGN(sizeof(u16), sizeof(s64)) + sizeof(s64)]  __aligned(8);
 	int ret;
 
 	ret = regmap_read(data->regmap, VCNL4035_ALS_DATA, (int *)buffer);
-- 
2.30.2