[PATCH 5.4 15/23] firmware: arm_scmi: Ensure drivers provide a probe function

From: Greg Kroah-Hartman
Date: Fri Aug 06 2021 - 04:19:52 EST


From: Sudeep Holla <sudeep.holla@xxxxxxx>

commit 5e469dac326555d2038d199a6329458cc82a34e5 upstream.

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@xxxxxxx
Fixes: 933c504424a2 ("firmware: arm_scmi: add scmi protocol bus to enumerate protocol devices")
Reported-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Tested-by: Cristian Marussi <cristian.marussi@xxxxxxx>
Reviewed-by: Cristian Marussi <cristian.marussi@xxxxxxx>
Acked-by: Uwe Kleine-König <u.kleine-koenig@xxxxxxxxxxxxxx>
Signed-off-by: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/firmware/arm_scmi/bus.c | 3 +++
1 file changed, 3 insertions(+)

--- a/drivers/firmware/arm_scmi/bus.c
+++ b/drivers/firmware/arm_scmi/bus.c
@@ -100,6 +100,9 @@ int scmi_driver_register(struct scmi_dri
{
int retval;

+ if (!driver->probe)
+ return -EINVAL;
+
driver->driver.bus = &scmi_bus_type;
driver->driver.name = driver->name;
driver->driver.owner = owner;