From: John Soni Jose <sony.john-n@emulex.com>
Date: Sat, 25 Apr 2015 02:47:45 +0000 (+0530)
Subject: be2iscsi : Fix memory check before unmapping.
X-Git-Tag: firefly_0821_release~176^2~1604^2~125
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=eb1c46924dfb48489272e8dc561bed9693e143d4;p=firefly-linux-kernel-4.4.55.git

be2iscsi : Fix memory check before unmapping.

 Check DMA memory before it is unmapped.

Signed-off-by: John Soni Jose <sony.john-n@emulex.com>
Signed-off-by: Jayamohan Kallickal <jayamohan.kallickal@emulex.com>
Reviewed-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
---

diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 7212bb47c075..65108370bfef 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -1368,8 +1368,10 @@ be_complete_io(struct beiscsi_conn *beiscsi_conn,
 	if (io_task->cmd_bhs->iscsi_hdr.flags & ISCSI_FLAG_CMD_READ)
 		conn->rxdata_octets += resid;
 unmap:
-	scsi_dma_unmap(io_task->scsi_cmnd);
-	io_task->scsi_cmnd = NULL;
+	if (io_task->scsi_cmnd) {
+		scsi_dma_unmap(io_task->scsi_cmnd);
+		io_task->scsi_cmnd = NULL;
+	}
 	iscsi_complete_scsi_task(task, exp_cmdsn, max_cmdsn);
 }
 
@@ -4609,11 +4611,13 @@ beiscsi_free_mgmt_task_handles(struct beiscsi_conn *beiscsi_conn,
 		spin_unlock_bh(&phba->mgmt_sgl_lock);
 	}
 
-	if (io_task->mtask_addr)
+	if (io_task->mtask_addr) {
 		pci_unmap_single(phba->pcidev,
 				 io_task->mtask_addr,
 				 io_task->mtask_data_count,
 				 PCI_DMA_TODEVICE);
+		io_task->mtask_addr = 0;
+	}
 }
 
 /**