linux-kernel - [PATCH] scsi: hpsa: Fix pointer dereferenced before checking

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Message-ID: <1653899188-26544-1-git-send-email-baihaowen@meizu.com>
Date:   Mon, 30 May 2022 16:26:27 +0800
From:   Haowen Bai <baihaowen@...zu.com>
To:     Don Brace <don.brace@...rochip.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
CC:     Haowen Bai <baihaowen@...zu.com>, <storagedev@...rochip.com>,
        <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: [PATCH] scsi: hpsa: Fix pointer dereferenced before checking

The dev->raid_map is dereferencing before null checking, so move
 it after checking.

Signed-off-by: Haowen Bai <baihaowen@...zu.com>
---
 drivers/scsi/hpsa.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/hpsa.c b/drivers/scsi/hpsa.c
index a47bcce3c9c7..fa785f60b1e6 100644
--- a/drivers/scsi/hpsa.c
+++ b/drivers/scsi/hpsa.c
@@ -5104,7 +5104,7 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
 {
 	struct scsi_cmnd *cmd = c->scsi_cmd;
 	struct hpsa_scsi_dev_t *dev = cmd->device->hostdata;
-	struct raid_map_data *map = &dev->raid_map;
+	struct raid_map_data *map;
 	struct raid_map_disk_data *dd = &map->data[0];
 	int is_write = 0;
 	u32 map_index;
@@ -5137,6 +5137,8 @@ static int hpsa_scsi_ioaccel_raid_map(struct ctlr_info *h,
 	if (!dev)
 		return -1;
 
+	map = &dev->raid_map;
+
 	if (dev->in_reset)
 		return -1;
 
-- 
2.7.4