From: Stefan Windfeldt-Prytz Date: Thu, 15 Feb 2018 14:02:53 +0000 (+0100) Subject: iio: buffer: check if a buffer has been set up when poll is called X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=4cd140bda6494543f1c1b0ccceceaa44b676eef6;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Jonathan Cameron --- diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index eda2a0f1658f..c7499c8bd69f 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -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);