[SCSI] qla2xxx: Correct use-after-free issue in terminate_rport_io callback.

The explicit logout (LOGO) issued at the end of the callback will
flush (via normal scsi_cmnd->done()) any outstanding commands
(FCP2) the firmware is holding.  While iterating through the
outstanding_cmnd array in qla2x00_abort_fcport_cmds(), locking
and unlocking of the hardware spinlock, opens-up the driver to
cases where the processed SRB (sp) could be used after the
command completed from interrupt context.

Cc: stable@kernel.org
Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

drivers/scsi/qla2xxx/qla_attr.c

@@ -1531,8 +1531,6 @@ qla2x00_terminate_rport_io(struct fc_rport *rport)
 		fcport->vha->hw->isp_ops->fabric_logout(fcport->vha,
 			fcport->loop_id, fcport->d_id.b.domain,
 			fcport->d_id.b.area, fcport->d_id.b.al_pa);
-
-	qla2x00_abort_fcport_cmds(fcport);
 }
 
 static int

drivers/scsi/qla2xxx/qla_gbl.h

@@ -96,7 +96,6 @@ extern int qla2x00_post_uevent_work(struct scsi_qla_host *, u32);
 
 extern int qla81xx_restart_mpi_firmware(scsi_qla_host_t *);
 
-extern void qla2x00_abort_fcport_cmds(fc_port_t *);
 extern struct scsi_qla_host *qla2x00_create_host(struct scsi_host_template *,
 	struct qla_hw_data *);
 extern void qla2x00_free_host(struct scsi_qla_host *);

drivers/scsi/qla2xxx/qla_os.c

@@ -682,44 +682,6 @@ qla2x00_wait_for_loop_ready(scsi_qla_host_t *vha)
 	return (return_status);
 }
 
-void
-qla2x00_abort_fcport_cmds(fc_port_t *fcport)
-{
-	int cnt;
-	unsigned long flags;
-	srb_t *sp;
-	scsi_qla_host_t *vha = fcport->vha;
-	struct qla_hw_data *ha = vha->hw;
-	struct req_que *req;
-
-	spin_lock_irqsave(&ha->hardware_lock, flags);
-	req = vha->req;
-	for (cnt = 1; cnt < MAX_OUTSTANDING_COMMANDS; cnt++) {
-		sp = req->outstanding_cmds[cnt];
-		if (!sp)
-			continue;
-		if (sp->fcport != fcport)
-			continue;
-		if (sp->ctx)
-			continue;
-
-		spin_unlock_irqrestore(&ha->hardware_lock, flags);
-		if (ha->isp_ops->abort_command(sp)) {
-			DEBUG2(qla_printk(KERN_WARNING, ha,
-			"Abort failed --  %lx\n",
-			sp->cmd->serial_number));
-		} else {
-			if (qla2x00_eh_wait_on_command(sp->cmd) !=
-				QLA_SUCCESS)
-				DEBUG2(qla_printk(KERN_WARNING, ha,
-				"Abort failed while waiting --  %lx\n",
-				sp->cmd->serial_number));
-		}
-		spin_lock_irqsave(&ha->hardware_lock, flags);
-	}
-	spin_unlock_irqrestore(&ha->hardware_lock, flags);
-}
-
 /**************************************************************************
 * qla2xxx_eh_abort
 *