From f18e7a068a0a31250cdb251810f8f6224931c3f5 Mon Sep 17 00:00:00 2001 From: Lars-Peter Clausen Date: Fri, 4 Oct 2013 12:06:00 +0100 Subject: iio: Return -ENODEV for file operations if the device has been unregistered If the IIO device has been unregistered return -ENODEV for any further file operations like read() and ioctl(). This avoids userspace being able to grab new references to the device. Signed-off-by: Lars-Peter Clausen Signed-off-by: Jonathan Cameron --- drivers/iio/industrialio-buffer.c | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'drivers/iio/industrialio-buffer.c') diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 36c39dc..6c7a9c5 100644 --- a/drivers/iio/industrialio-buffer.c +++ b/drivers/iio/industrialio-buffer.c @@ -48,6 +48,9 @@ ssize_t iio_buffer_read_first_n_outer(struct file *filp, char __user *buf, struct iio_dev *indio_dev = filp->private_data; struct iio_buffer *rb = indio_dev->buffer; + if (!indio_dev->info) + return -ENODEV; + if (!rb || !rb->access->read_first_n) return -EINVAL; return rb->access->read_first_n(rb, n, buf); @@ -62,6 +65,9 @@ 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) + return -ENODEV; + poll_wait(filp, &rb->pollq, wait); if (rb->stufftoread) return POLLIN | POLLRDNORM; -- cgit v1.1