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d837a996f5
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.
As Lars also noted this anti pattern can involve a leak of data to
userspace and that indeed can happen here. We close both issues by
moving to a suitable structure in the iio_priv()
This data is allocated with kzalloc() so no data can leak apart
from previous readings.
A local unsigned int variable is used for the regmap call so it
is clear there is no potential issue with writing into the padding
of the structure.
Fixes: 3025c8688c ("iio: light: add support for UVIS25 sensor")
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200920112742.170751-3-jic23@kernel.org
41 lines
897 B
C
41 lines
897 B
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* STMicroelectronics uvis25 sensor driver
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*
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* Copyright 2017 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi83@gmail.com>
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*/
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#ifndef ST_UVIS25_H
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#define ST_UVIS25_H
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#define ST_UVIS25_DEV_NAME "uvis25"
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#include <linux/iio/iio.h>
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/**
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* struct st_uvis25_hw - ST UVIS25 sensor instance
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* @regmap: Register map of the device.
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* @trig: The trigger in use by the driver.
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* @enabled: Status of the sensor (false->off, true->on).
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* @irq: Device interrupt line (I2C or SPI).
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*/
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struct st_uvis25_hw {
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struct regmap *regmap;
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struct iio_trigger *trig;
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bool enabled;
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int irq;
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/* Ensure timestamp is naturally aligned */
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struct {
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u8 chan;
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s64 ts __aligned(8);
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} scan;
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};
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extern const struct dev_pm_ops st_uvis25_pm_ops;
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int st_uvis25_probe(struct device *dev, int irq, struct regmap *regmap);
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#endif /* ST_UVIS25_H */
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