iio: imu: kmx61: fix information leak in triggered buffer

commit 6ae053113f6a226a2303caa4936a4c37f3bfff7b upstream.

The 'buffer' local array is used to push data to user space from a
triggered buffer, but it does not set values for inactive channels, as
it only uses iio_for_each_active_channel() to assign new values.

Initialize the array to zero before using it to avoid pushing
uninitialized information to userspace.

Cc: stable@vger.kernel.org
Fixes: c3a23ecc0901 ("iio: imu: kmx61: Add support for data ready triggers")
Signed-off-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Link: https://patch.msgid.link/20241125-iio_memset_scan_holes-v1-5-0cb6e98d895c@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/iio/imu/kmx61.c b/drivers/iio/imu/kmx61.c
index f89724481df9323ef520a41ed891b60c84134746..950570ae2980fdcce607fd0acaf3af90b6f98a77 100644 (file)
--- a/drivers/iio/imu/kmx61.c
+++ b/drivers/iio/imu/kmx61.c
@@ -1192,7 +1192,7 @@ static irqreturn_t kmx61_trigger_handler(int irq, void *p)
        struct kmx61_data *data = kmx61_get_data(indio_dev);
        int bit, ret, i = 0;
        u8 base;
-       s16 buffer[8];
+       s16 buffer[8] = { };
 
        if (indio_dev == data->acc_indio_dev)
                base = KMX61_ACC_XOUT_L;