iio:humidity:hts221 Fix alignment and data leak issues

BugLink: https://bugs.launchpad.net/bugs/1888560
commit 5c49056ad9f3c786f7716da2dd47e4488fc6bd25 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() data.
This data is allocated with kzalloc so no data can leak
apart from previous readings.

Explicit alignment of ts needed to ensure consistent padding
on all architectures (particularly x86_32 with it's 4 byte alignment
of s64)

Fixes: e4a70e3e7d84 ("iio: humidity: add support to hts221 rh/temp combo device")
Reported-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kelsey Skunberg <kelsey.skunberg@canonical.com>

diff --git a/drivers/iio/humidity/hts221.h b/drivers/iio/humidity/hts221.h
index 7d6771f7cf473663b7607a0fc886fa2b4822d802..b2eb5abeaccd3f466848e1bbd318563761089a3f 100644 (file)
--- a/drivers/iio/humidity/hts221.h
+++ b/drivers/iio/humidity/hts221.h
@@ -14,8 +14,6 @@
 
 #include <linux/iio/iio.h>
 
-#define HTS221_DATA_SIZE       2
-
 enum hts221_sensor_type {
        HTS221_SENSOR_H,
        HTS221_SENSOR_T,
@@ -39,6 +37,11 @@ struct hts221_hw {
 
        bool enabled;
        u8 odr;
+       /* Ensure natural alignment of timestamp */
+       struct {
+               __le16 channels[2];
+               s64 ts __aligned(8);
+       } scan;
 };
 
 extern const struct dev_pm_ops hts221_pm_ops;

diff --git a/drivers/iio/humidity/hts221_buffer.c b/drivers/iio/humidity/hts221_buffer.c
index 81d50a861c22397a2f9d5f90769b5f21b61ba884..49dcd36d8838ed7cfbe3e2ea340d64de2f1e1edc 100644 (file)
--- a/drivers/iio/humidity/hts221_buffer.c
+++ b/drivers/iio/humidity/hts221_buffer.c
@@ -162,7 +162,6 @@ static const struct iio_buffer_setup_ops hts221_buffer_ops = {
 
 static irqreturn_t hts221_buffer_handler_thread(int irq, void *p)
 {
-       u8 buffer[ALIGN(2 * HTS221_DATA_SIZE, sizeof(s64)) + sizeof(s64)];
        struct iio_poll_func *pf = p;
        struct iio_dev *iio_dev = pf->indio_dev;
        struct hts221_hw *hw = iio_priv(iio_dev);
@@ -172,18 +171,20 @@ static irqreturn_t hts221_buffer_handler_thread(int irq, void *p)
        /* humidity data */
        ch = &iio_dev->channels[HTS221_SENSOR_H];
        err = regmap_bulk_read(hw->regmap, ch->address,
-                              buffer, HTS221_DATA_SIZE);
+                              &hw->scan.channels[0],
+                              sizeof(hw->scan.channels[0]));
        if (err < 0)
                goto out;
 
        /* temperature data */
        ch = &iio_dev->channels[HTS221_SENSOR_T];
        err = regmap_bulk_read(hw->regmap, ch->address,
-                              buffer + HTS221_DATA_SIZE, HTS221_DATA_SIZE);
+                              &hw->scan.channels[1],
+                              sizeof(hw->scan.channels[1]));
        if (err < 0)
                goto out;
 
-       iio_push_to_buffers_with_timestamp(iio_dev, buffer,
+       iio_push_to_buffers_with_timestamp(iio_dev, &hw->scan,
                                           iio_get_time_ns(iio_dev));
 
 out: