iio: core: Fix double free.

When an error occurred during event registration memory was freed twice
resulting in kernel memory corruption and a crash in unrelated code.

The problem was caused by
	iio_device_unregister_eventset()
	iio_device_unregister_sysfs()

being called twice, once on the error path and then
again via iio_dev_release().

Fix this by making these two functions idempotent so they
may be called multiple times.

The problem was observed before applying
	78b33216 iio:core: Handle error when mask type is not separate

Signed-off-by: Martin Fuzzey <mfuzzey@parkeon.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>

diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index aaba9d3..4df97f6 100644 (file)
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -847,8 +847,7 @@ static int iio_device_add_channel_sysfs(struct iio_dev *indio_dev,
  * @attr_list: List of IIO device attributes
  *
  * This function frees the memory allocated for each of the IIO device
- * attributes in the list. Note: if you want to reuse the list after calling
- * this function you have to reinitialize it using INIT_LIST_HEAD().
+ * attributes in the list.
  */
 void iio_free_chan_devattr_list(struct list_head *attr_list)
 {
@@ -856,6 +855,7 @@ void iio_free_chan_devattr_list(struct list_head *attr_list)
 
        list_for_each_entry_safe(p, n, attr_list, l) {
                kfree(p->dev_attr.attr.name);
+               list_del(&p->l);
                kfree(p);
        }
 }
@@ -936,6 +936,7 @@ static void iio_device_unregister_sysfs(struct iio_dev *indio_dev)
 
        iio_free_chan_devattr_list(&indio_dev->channel_attr_list);
        kfree(indio_dev->chan_attr_group.attrs);
+       indio_dev->chan_attr_group.attrs = NULL;
 }
 
 static void iio_dev_release(struct device *device)

diff --git a/drivers/iio/industrialio-event.c b/drivers/iio/industrialio-event.c
index a4b3970..a99692b 100644 (file)
--- a/drivers/iio/industrialio-event.c
+++ b/drivers/iio/industrialio-event.c
@@ -500,6 +500,7 @@ int iio_device_register_eventset(struct iio_dev *indio_dev)
 error_free_setup_event_lines:
        iio_free_chan_devattr_list(&indio_dev->event_interface->dev_attr_list);
        kfree(indio_dev->event_interface);
+       indio_dev->event_interface = NULL;
        return ret;
 }