iio:light:rpr0521: Fix timestamp alignment and prevent data leak.

commit a61817216bcc755eabbcb1cf281d84ccad267ed1 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.
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 and in this case the status byte from the device.

The forced alignment of ts is not necessary in this case but it
potentially makes the code less fragile.

>From personal communications with Mikko:

We could probably split the reading of the int register, but it
would mean a significant performance cost of 20 i2c clock cycles.

Fixes: e12ffd241c00 ("iio: light: rpr0521 triggered buffer")
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Alexandru Ardelean <alexandru.ardelean@analog.com>
Cc: Mikko Koivunen <mikko.koivunen@fi.rohmeurope.com>
Cc: <Stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200920112742.170751-2-jic23@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/light/rpr0521.c b/drivers/iio/light/rpr0521.c
index a6efa12613a26234d6b2135b935b7a825714e8d2..f635c607b309133e6900a16a370fd2777f4f2967 100644 (file)
--- a/drivers/iio/light/rpr0521.c
+++ b/drivers/iio/light/rpr0521.c
@@ -197,6 +197,17 @@ struct rpr0521_data {
        bool pxs_need_dis;
 
        struct regmap *regmap;
+
+       /*
+        * Ensure correct naturally aligned timestamp.
+        * Note that the read will put garbage data into
+        * the padding but this should not be a problem
+        */
+       struct {
+               __le16 channels[3];
+               u8 garbage;
+               s64 ts __aligned(8);
+       } scan;
 };
 
 static IIO_CONST_ATTR(in_intensity_scale_available, RPR0521_ALS_SCALE_AVAIL);
@@ -452,8 +463,6 @@ static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
        struct rpr0521_data *data = iio_priv(indio_dev);
        int err;
 
-       u8 buffer[16]; /* 3 16-bit channels + padding + ts */
-
        /* Use irq timestamp when reasonable. */
        if (iio_trigger_using_own(indio_dev) && data->irq_timestamp) {
                pf->timestamp = data->irq_timestamp;
@@ -464,11 +473,11 @@ static irqreturn_t rpr0521_trigger_consumer_handler(int irq, void *p)
                pf->timestamp = iio_get_time_ns(indio_dev);
 
        err = regmap_bulk_read(data->regmap, RPR0521_REG_PXS_DATA,
-               &buffer,
+               data->scan.channels,
                (3 * 2) + 1);   /* 3 * 16-bit + (discarded) int clear reg. */
        if (!err)
                iio_push_to_buffers_with_timestamp(indio_dev,
-                                                  buffer, pf->timestamp);
+                                                  &data->scan, pf->timestamp);
        else
                dev_err(&data->client->dev,
                        "Trigger consumer can't read from sensor.\n");