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>

diff --git a/drivers/iio/industrialio-buffer.c b/drivers/iio/industrialio-buffer.c
index 36c39dc..6c7a9c5 100644 (file)
--- 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;

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index f939bad..a019a7b 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -1040,6 +1040,9 @@ static long iio_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
        int __user *ip = (int __user *)arg;
        int fd;
 
+       if (!indio_dev->info)
+               return -ENODEV;
+
        if (cmd == IIO_GET_EVENT_FD_IOCTL) {
                fd = iio_event_getfd(indio_dev);
                if (copy_to_user(ip, &fd, sizeof(fd)))

diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index 36f0c8e..837d450 100644 (file)
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -76,6 +76,9 @@ static unsigned int iio_event_poll(struct file *filep,
        struct iio_event_interface *ev_int = indio_dev->event_interface;
        unsigned int events = 0;
 
+       if (!indio_dev->info)
+               return -ENODEV;
+
        poll_wait(filep, &ev_int->wait, wait);
 
        spin_lock_irq(&ev_int->wait.lock);
@@ -96,6 +99,9 @@ static ssize_t iio_event_chrdev_read(struct file *filep,
        unsigned int copied;
        int ret;
 
+       if (!indio_dev->info)
+               return -ENODEV;
+
        if (count < sizeof(struct iio_event_data))
                return -EINVAL;