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

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>
zero-colors
Stefan Windfeldt-Prytz 2018-02-15 15:02:53 +01:00 committed by Jonathan Cameron
parent f027e0b3a7
commit 4cd140bda6
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);