scsi: libfc: Fix potential NULL pointer dereference in fc_lport_ptp_setup()

[ Upstream commit 4df105f0ce9f6f30cda4e99f577150d23f0c9c5f ]

fc_lport_ptp_setup() did not check the return value of fc_rport_create()
which can return NULL and would cause a NULL pointer dereference. Address
this issue by checking return value of fc_rport_create() and log error
message on fc_rport_create() failed.

Signed-off-by: Wenchao Hao <haowenchao2@huawei.com>
Link: https://lore.kernel.org/r/20231011130350.819571-1-haowenchao2@huawei.com
Reviewed-by: Simon Horman <horms@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index 9c02c95..ab06e9a 100644 (file)
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -241,6 +241,12 @@ static void fc_lport_ptp_setup(struct fc_lport *lport,
        }
        mutex_lock(&lport->disc.disc_mutex);
        lport->ptp_rdata = fc_rport_create(lport, remote_fid);
+       if (!lport->ptp_rdata) {
+               printk(KERN_WARNING "libfc: Failed to setup lport 0x%x\n",
+                       lport->port_id);
+               mutex_unlock(&lport->disc.disc_mutex);
+               return;
+       }
        kref_get(&lport->ptp_rdata->kref);
        lport->ptp_rdata->ids.port_name = remote_wwpn;
        lport->ptp_rdata->ids.node_name = remote_wwnn;