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authorLars-Peter Clausen <lars@metafoo.de>2013-10-04 12:06:00 +0100
committerJonathan Cameron <jic23@kernel.org>2013-10-12 12:04:17 +0100
commitf18e7a068a0a31250cdb251810f8f6224931c3f5 (patch)
tree9692a94465954c615370dec9cd82baeb4387a211
parent9e69c935fad9fd5f0550c51e3bd251cd30033136 (diff)
downloadop-kernel-dev-f18e7a068a0a31250cdb251810f8f6224931c3f5.zip
op-kernel-dev-f18e7a068a0a31250cdb251810f8f6224931c3f5.tar.gz
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>
-rw-r--r--drivers/iio/industrialio-buffer.c6
-rw-r--r--drivers/iio/industrialio-core.c3
-rw-r--r--drivers/iio/industrialio-event.c6
3 files changed, 15 insertions, 0 deletions
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;
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index f939bad..a019a7b 100644
--- 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
--- 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;
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