From: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
[ Upstream commit 14d5511691e5290103bc480998bc322e68f139d4 ]
If cec_notifier_cec_adap_unregister() is called before
cec_unregister_adapter() then everything is OK (and this is the
case today). But if it is the other way around, then
cec_notifier_unregister() is called first, and that doesn't
set n->cec_adap to NULL.
So if e.g. cec_notifier_set_phys_addr() is called after
cec_notifier_unregister() but before cec_unregister_adapter()
then n->cec_adap points to an unregistered and likely deleted
cec adapter. So just set n->cec_adap->notifier and n->cec_adap
to NULL for rubustness.
Eventually cec_notifier_unregister will disappear and this will
be simplified substantially.
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/media/cec/cec-notifier.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
index dd2078b27a419..2424680f71c3d 100644
--- a/drivers/media/cec/cec-notifier.c
+++ b/drivers/media/cec/cec-notifier.c
@@ -123,6 +123,8 @@ void cec_notifier_unregister(struct cec_notifier *n)
{
mutex_lock(&n->lock);
n->callback = NULL;
+ n->cec_adap->notifier = NULL;
+ n->cec_adap = NULL;
mutex_unlock(&n->lock);
cec_notifier_put(n);
}
--
2.20.1
