From mboxrd@z Thu Jan 1 00:00:00 1970 From: Suman Anna Subject: [PATCH v2 12/13] mailbox: check for NULL nb in mailbox_put Date: Mon, 11 Feb 2013 22:57:11 -0600 Message-ID: <1360645032-9668-13-git-send-email-s-anna@ti.com> References: <1360645032-9668-1-git-send-email-s-anna@ti.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1360645032-9668-1-git-send-email-s-anna@ti.com> Sender: linux-kernel-owner@vger.kernel.org To: Greg Kroah-Hartman Cc: Linus Walleij , Russell King , Tony Lindgren , Arnd Bergmann , Ohad Ben-Cohen , Paul Walmsley , Benoit Cousson , Loic Pallardy , Omar Ramirez Luna , linux-omap@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Mark Brown , Janusz Krzysztofik , Dom Cobley , Wim Van Sebroeck , Felipe Contreras , Tejun Heo , Omar Ramirez Luna , Suman Anna , Fernando Guzman Lugo List-Id: linux-omap@vger.kernel.org The mailbox_put function must check the notifier block for NULL before trying to unregister it. Signed-off-by: Fernando Guzman Lugo Signed-off-by: Suman Anna --- 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