[PATCH v4 5/8] v4l2-async: Safely clean up an uninitialised notifier

[Sakari Ailus]

Make the V4L2 async framework a bit more robust by allowing to clean up an
uninitialised notifier. Otherwise the result would be a (close to) NULL
pointer dereference.

Signed-off-by: Sakari Ailus <sakari.ai...@linux.intel.com>
---
 drivers/media/v4l2-core/v4l2-async.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/v4l2-core/v4l2-async.c 
b/drivers/media/v4l2-core/v4l2-async.c
index ac686125354a..e861e69c7096 100644
--- a/drivers/media/v4l2-core/v4l2-async.c
+++ b/drivers/media/v4l2-core/v4l2-async.c
@@ -537,7 +537,7 @@ static void __v4l2_async_notifier_cleanup(struct 
v4l2_async_notifier *notifier)
 {
        struct v4l2_async_subdev *asd, *tmp;
 
-       if (!notifier)
+       if (!notifier || !notifier->asd_list.next)
                return;
 
        list_for_each_entry_safe(asd, tmp, &notifier->asd_list, asd_list) {
-- 
2.11.0