iio:accel:mma7455: Fix timestamp alignment and prevent data leak.
commit7e5ac1f220
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 a 16 byte u8 array 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() data with alignment ensured by use of an explicit c structure. This data is allocated with kzalloc so no data can leak appart from previous readings. The force alignment of ts is not strictly necessary in this particularly case but does make the code less fragile. Fixes:a84ef0d181
("iio: accel: add Freescale MMA7455L/MMA7456L 3-axis accelerometer driver") Reported-by: Lars-Peter Clausen <lars@metafoo.de> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: <Stable@vger.kernel.org> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -52,6 +52,14 @@
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struct mma7455_data {
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struct regmap *regmap;
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/*
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* Used to reorganize data. Will ensure correct alignment of
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* the timestamp if present
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*/
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struct {
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__le16 channels[3];
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s64 ts __aligned(8);
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} scan;
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};
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static int mma7455_drdy(struct mma7455_data *mma7455)
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@ -82,19 +90,19 @@ static irqreturn_t mma7455_trigger_handler(int irq, void *p)
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struct iio_poll_func *pf = p;
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struct iio_dev *indio_dev = pf->indio_dev;
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struct mma7455_data *mma7455 = iio_priv(indio_dev);
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u8 buf[16]; /* 3 x 16-bit channels + padding + ts */
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int ret;
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ret = mma7455_drdy(mma7455);
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if (ret)
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goto done;
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ret = regmap_bulk_read(mma7455->regmap, MMA7455_REG_XOUTL, buf,
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sizeof(__le16) * 3);
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ret = regmap_bulk_read(mma7455->regmap, MMA7455_REG_XOUTL,
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mma7455->scan.channels,
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sizeof(mma7455->scan.channels));
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if (ret)
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goto done;
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iio_push_to_buffers_with_timestamp(indio_dev, buf,
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iio_push_to_buffers_with_timestamp(indio_dev, &mma7455->scan,
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iio_get_time_ns(indio_dev));
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done:
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