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| author |   Lars-Peter Clausen <lars@metafoo.de> | 2012-06-15 18:08:59 +0200 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-06-15 14:39:19 -0700 |
| commit | aff1eb4e3dd13ee419c6cd76baf1bcc2edeaaa86 (patch) | |
| tree | 36fbc70e56ffa72bcb33067a178981cb9f841b82 /drivers/iio | |
| parent | iio: iio/events.h typos (diff) | |
| download | linux-dev-aff1eb4e3dd13ee419c6cd76baf1bcc2edeaaa86.tar.xz linux-dev-aff1eb4e3dd13ee419c6cd76baf1bcc2edeaaa86.zip | |
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>
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/industrialio-buffer.c | 4 |
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) |