scsi: smartpqi: Fix device pointer variable reference static checker issue

Dan Carpenter found a possible NULL pointer dereference issue in function
pqi_sas_port_add_rphy():

   drivers/scsi/smartpqi/smartpqi_sas_transport.c:97
   pqi_sas_port_add_rphy() warn: variable dereferenced before
   check 'pqi_sas_port->device' (see line 95)

Correct issue by moving reference of pqi_sas_port->device after the check
for the device pointer being non-NULL.

Link: https://www.mail-archive.com/kbuild@lists.01.org/msg06329.html
Link: https://lore.kernel.org/r/161850493026.7302.10032784239320437353.stgit@brunhilda
Fixes: ec504b23df9d ("scsi: smartpqi: Add phy ID support for the physical drives")
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: kernel test robot <lkp@intel.com>
Reviewed-by: Scott Benesh <scott.benesh@microchip.com>
Reviewed-by: Scott Teel <scott.teel@microchip.com>
Reviewed-by: Mike McGowen <mike.mcgowen@microchip.com>
Reviewed-by: Kevin Barnett <kevin.barnett@microchip.com>
Signed-off-by: Don Brace <don.brace@microchip.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/smartpqi/smartpqi_sas_transport.c b/drivers/scsi/smartpqi/smartpqi_sas_transport.c
index dd9b784..dd628cc 100644 (file)
--- a/drivers/scsi/smartpqi/smartpqi_sas_transport.c
+++ b/drivers/scsi/smartpqi/smartpqi_sas_transport.c
@@ -92,12 +92,12 @@ static int pqi_sas_port_add_rphy(struct pqi_sas_port *pqi_sas_port,
 
        identify = &rphy->identify;
        identify->sas_address = pqi_sas_port->sas_address;
-       identify->phy_identifier = pqi_sas_port->device->phy_id;
 
        identify->initiator_port_protocols = SAS_PROTOCOL_ALL;
        identify->target_port_protocols = SAS_PROTOCOL_STP;
 
        if (pqi_sas_port->device) {
+               identify->phy_identifier = pqi_sas_port->device->phy_id;
                switch (pqi_sas_port->device->device_type) {
                case SA_DEVICE_TYPE_SAS:
                case SA_DEVICE_TYPE_SES: