iio: buffer: Fix NULL pointer deref caused by empty scan mask

iio_scan_mask_match() returns NULL if the passed in scan mask is empty. This
will happen if no channel has been selected and buffer is enabled.
iio_sw_buffer_preenable() will assign NULL to indio_dev->active_scan_mask in
this case. As a result iio_update_demux() will cause a NULL pointer deref,
because it expects active_scan_mask to be non-NULL.

Since it does not make much sense to start data capture if there is no data to
capture this patch updates the code to fail gracefully in iio_scan_mask_match()
instead of crashing the kernel.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index ac185b8694bd..2f35db93cdb6 100644
--- a/drivers/iio/industrialio-buffer.c
+++ b/drivers/iio/industrialio-buffer.c
@@ -553,6 +553,10 @@ int iio_sw_buffer_preenable(struct iio_dev *indio_dev)
                                             buffer->scan_mask);
         else
                 indio_dev->active_scan_mask = buffer->scan_mask;
+
+        if (indio_dev->active_scan_mask == NULL)
+                return -EINVAL;
+
         iio_update_demux(indio_dev);
 
         if (indio_dev->info->update_scan_mode)