iio: accel: sca3000: memory corruption in sca3000_read_first_n_hw_rb()

commit eda7d0f38aaf50dbb2a2de15e8db386c4f6f65fc upstream.

"num_read" is in byte units but we are write u16s so we end up write
twice as much as intended.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
[ luis: backported to 3.16: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>

diff --git a/drivers/staging/iio/accel/sca3000_ring.c b/drivers/staging/iio/accel/sca3000_ring.c
index 198710651e0ed3c951c1d5116f438d38615f76b0..737ce026029b5618c9e0af9df85d407f47ce17d2 100644 (file)
--- a/drivers/staging/iio/accel/sca3000_ring.c
+++ b/drivers/staging/iio/accel/sca3000_ring.c
@@ -116,7 +116,7 @@ static int sca3000_read_first_n_hw_rb(struct iio_buffer *r,
        if (ret)
                goto error_ret;
 
-       for (i = 0; i < num_read; i++)
+       for (i = 0; i < num_read / sizeof(u16); i++)
                *(((u16 *)rx) + i) = be16_to_cpup((u16 *)rx + i);
 
        if (copy_to_user(buf, rx, num_read))