diff options
| author | Lars-Peter Clausen <lars@metafoo.de> | 2013-10-04 12:06:00 +0100 |
|---|---|---|
| committer | Jonathan Cameron <jic23@kernel.org> | 2013-10-12 12:04:17 +0100 |
| commit | f18e7a068a0a31250cdb251810f8f6224931c3f5 (patch) | |
| tree | 9692a94465954c615370dec9cd82baeb4387a211 /drivers/iio/industrialio-buffer.c | |
| parent | 9e69c935fad9fd5f0550c51e3bd251cd30033136 (diff) | |
| download | lwn-f18e7a068a0a31250cdb251810f8f6224931c3f5.tar.gz lwn-f18e7a068a0a31250cdb251810f8f6224931c3f5.zip | |
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 <lars@metafoo.de>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
Diffstat (limited to 'drivers/iio/industrialio-buffer.c')
| -rw-r--r-- | drivers/iio/industrialio-buffer.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c index 36c39dcad850..6c7a9c509399 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; |