linux-kernel - [PATCH] scsi: hisi_sas: add null check before indirect pointer dereference

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Date:   Mon, 22 May 2017 13:00:29 -0500
From:   "Gustavo A. R. Silva" <garsilva@...eddedor.com>
To:     John Garry <john.garry@...wei.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <garsilva@...eddedor.com>
Subject: [PATCH] scsi: hisi_sas: add null check before indirect pointer
 dereference

Add null check before indirectly dereferencing pointer task->lldd_task
in statement u32 tag = slot->idx;

Addresses-Coverity-ID: 1373843
Signed-off-by: Gustavo A. R. Silva <garsilva@...eddedor.com>
---
 drivers/scsi/hisi_sas/hisi_sas_main.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index d622db5..f720d3c 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -963,7 +963,7 @@ static int hisi_sas_abort_task(struct sas_task *task)
 						     HISI_SAS_INT_ABT_DEV, 0);
 			rc = hisi_sas_softreset_ata_disk(device);
 		}
-	} else if (task->task_proto & SAS_PROTOCOL_SMP) {
+	} else if (task->lldd_task && task->task_proto & SAS_PROTOCOL_SMP) {
 		/* SMP */
 		struct hisi_sas_slot *slot = task->lldd_task;
 		u32 tag = slot->idx;
-- 
2.5.0