scsi: qla2xxx: Fix system crash in qlt_plogi_ack_unref

commit 19759033e0d0beed70421ab9258f5ede79e070ae upstream.

Fix system crash due to NULL pointer access.

qlt_plogi_ack_t and fc_port structures were not properly bound before
calling qlt_plogi_ack_unref().

RIP: 0010:qlt_plogi_ack_unref+0xa1/0x150 [qla2xxx]
Call Trace:
qla24xx_create_new_sess+0xb1/0x320 [qla2xxx]
qla2x00_do_work+0x123/0x260 [qla2xxx]
qla2x00_iocb_work_fn+0x30/0x40 [qla2xxx]
process_one_work+0x1f3/0x530
worker_thread+0x4e/0x480
kthread+0x10c/0x140

Fixes: 726b85487067d ("qla2xxx: Add framework for async fabric discovery")
Cc: <stable@vger.kernel.org> # 4.10+
Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index b1a52627759b437616fd4c2e90daf9a7f5b0e1a2..52c857e2f354707f3b64ae94024a40c2c390b532 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -4734,11 +4734,11 @@ void qla24xx_create_new_sess(struct scsi_qla_host *vha, struct qla_work_evt *e)
                } else {
                        list_add_tail(&fcport->list, &vha->vp_fcports);
 
-                       if (pla) {
-                               qlt_plogi_ack_link(vha, pla, fcport,
-                                   QLT_PLOGI_LINK_SAME_WWN);
-                               pla->ref_count--;
-                       }
+               }
+               if (pla) {
+                       qlt_plogi_ack_link(vha, pla, fcport,
+                           QLT_PLOGI_LINK_SAME_WWN);
+                       pla->ref_count--;
                }
        }
        spin_unlock_irqrestore(&vha->hw->tgt.sess_lock, flags);