diff mbox series

[5.13,048/223] firmware: arm_scmi: Ensure drivers provide a probe function

Message ID 20210726153847.842147348@linuxfoundation.org
State New
Headers show
Series None | expand

Commit Message

Greg Kroah-Hartman July 26, 2021, 3:37 p.m. UTC 
From: Sudeep Holla <sudeep.holla@arm.com>


[ Upstream commit 5e469dac326555d2038d199a6329458cc82a34e5 ]

The bus probe callback calls the driver callback without further
checking. Better be safe than sorry and refuse registration of a driver
without a probe function to prevent a NULL pointer exception.

Link: https://lore.kernel.org/r/20210624095059.4010157-2-sudeep.holla@arm.com
Fixes: 933c504424a2 ("firmware: arm_scmi: add scmi protocol bus to enumerate protocol devices")
Reported-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Tested-by: Cristian Marussi <cristian.marussi@arm.com>

Reviewed-by: Cristian Marussi <cristian.marussi@arm.com>

Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>

Signed-off-by: Sudeep Holla <sudeep.holla@arm.com>

Signed-off-by: Sasha Levin <sashal@kernel.org>

---
 drivers/firmware/arm_scmi/bus.c | 3 +++
 1 file changed, 3 insertions(+)

-- 
2.30.2
diff mbox series

Patch

diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c
index 784cf0027da3..9184a0d5acbe 100644
--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -139,6 +139,9 @@  int scmi_driver_register(struct scmi_driver *driver, struct module *owner,
 {
 	int retval;
 
+	if (!driver->probe)
+		return -EINVAL;
+
 	retval = scmi_protocol_device_request(driver->id_table);
 	if (retval)
 		return retval;