iio:buffer: make length types match kfifo types

Currently, we use int for buffer length and bytes_per_datum. However,
kfifo uses unsigned int for length and size_t for element size. We need
to make sure these matches or we will have bugs related to overflow (in
the range between INT_MAX and UINT_MAX for length, for example).

In addition, set_bytes_per_datum uses size_t while bytes_per_datum is an
int, which would cause bugs for large values of bytes_per_datum.

Change buffer length to use unsigned int and bytes_per_datum to use
size_t.

Signed-off-by: Martin Kelly <mkelly@xevo.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/include/linux/iio/buffer_impl.h b/include/linux/iio/buffer_impl.h
index b9e22b7e2f28..d1171db23742 100644
--- a/include/linux/iio/buffer_impl.h
+++ b/include/linux/iio/buffer_impl.h
@@ -53,7 +53,7 @@ struct iio_buffer_access_funcs {
         int (*request_update)(struct iio_buffer *buffer);
 
         int (*set_bytes_per_datum)(struct iio_buffer *buffer, size_t bpd);
-        int (*set_length)(struct iio_buffer *buffer, int length);
+        int (*set_length)(struct iio_buffer *buffer, unsigned int length);
 
         int (*enable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
         int (*disable)(struct iio_buffer *buffer, struct iio_dev *indio_dev);
@@ -72,10 +72,10 @@ struct iio_buffer_access_funcs {
  */
 struct iio_buffer {
         /** @length: Number of datums in buffer. */
-        int length;
+        unsigned int length;
 
         /**  @bytes_per_datum: Size of individual datum including timestamp. */
-        int bytes_per_datum;
+        size_t bytes_per_datum;
 
         /**
          * @access: Buffer access functions associated with the