From: Sudeep Holla sudeep.holla@arm.com
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@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: Greg Kroah-Hartman gregkh@linuxfoundation.org --- 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;