The mailbox_put function must check the notifier block for
NULL before trying to unregister it.
Signed-off-by: Fernando Guzman Lugo <lugo.fernando@xxxxxxxxx>
Signed-off-by: Suman Anna <s-anna@xxxxxx>
---
drivers/mailbox/mailbox.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mailbox/mailbox.c b/drivers/mailbox/mailbox.c
index eaaf87e..c38241a 100644
--- a/drivers/mailbox/mailbox.c
+++ b/drivers/mailbox/mailbox.c
@@ -473,7 +473,8 @@ EXPORT_SYMBOL(mailbox_get);
void mailbox_put(struct mailbox *mbox, struct notifier_block *nb)
{
- blocking_notifier_chain_unregister(&mbox->notifier, nb);
+ if (nb)
+ blocking_notifier_chain_unregister(&mbox->notifier, nb);
mailbox_fini(mbox);
}
EXPORT_SYMBOL(mailbox_put);
--
1.8.1.2
--
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