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media: v4l2-async: Safely clean up an uninitialised notifier

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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.ailus@linux.intel.com>
Tested-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Sakari Ailus
2019-03-04 04:29:49 -05:00
committed by Mauro Carvalho Chehab
parent 2ea4cfc9a7
commit d1e164289e
1 changed files with 1 additions and 1 deletions
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2
drivers/media/v4l2-core/v4l2-async.c
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@@ -534,7 +534,7 @@ 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) {