[PATCH 3.2 18/60] iio: accel: sca3000: memory corruption in sca3000_read_first_n_hw_rb()

[Ben Hutchings]

3.2.73-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Dan Carpenter <dan.carpenter@xxxxxxxxxx>

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@xxxxxxxxxx>
Signed-off-by: Jonathan Cameron <jic23@xxxxxxxxxx>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/staging/iio/accel/sca3000_ring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/staging/iio/accel/sca3000_ring.c
+++ b/drivers/staging/iio/accel/sca3000_ring.c
@@ -120,7 +120,7 @@ static int sca3000_read_first_n_hw_rb(st
 	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))

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