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iio: buffer: check if a buffer has been set up when poll is called 

commit 4cd140bda6 upstream.

If no iio buffer has been set up and poll is called return 0.
Without this check there will be a null pointer dereference when
calling poll on a iio driver without an iio buffer.

Cc: stable@vger.kernel.org
Signed-off-by: Stefan Windfeldt-Prytz <stefan.windfeldt@axis.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
pull/10/head
Stefan Windfeldt-Prytz 2018-02-15 15:02:53 +01:00 committed by Greg Kroah-Hartman
parent 1b985a6e8d
commit 9dc4030c87
1 changed files with 1 additions and 1 deletions
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2
drivers/iio/industrialio-buffer.c
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@ -175,7 +175,7 @@ unsigned int iio_buffer_poll(struct file *filp,
struct iio_dev *indio_dev = filp->private_data;
struct iio_buffer *rb = indio_dev->buffer;
if (!indio_dev->info)
if (!indio_dev->info || rb == NULL)
return 0;
poll_wait(filp, &rb->pollq, wait);