linux-kernel - [PATCH 2/4] SCSI: pm8001: avoid NULL pointer dereference

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Message-Id: <1262828921-29517-2-git-send-email-a.beregalov@gmail.com>
Date:	Thu,  7 Jan 2010 04:48:39 +0300
From:	Alexander Beregalov <a.beregalov@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	Alexander Beregalov <a.beregalov@...il.com>,
	James Bottomley <James.Bottomley@...e.de>
Subject: [PATCH 2/4] SCSI: pm8001: avoid NULL pointer dereference

Assign device_id only if pm8001_dev is not NULL.

Cc: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Alexander Beregalov <a.beregalov@...il.com>
---
 drivers/scsi/pm8001/pm8001_sas.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 7f9c83a..4e748d1 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -884,11 +884,12 @@ static void pm8001_dev_gone_notify(struct domain_device *dev)
 	u32 tag;
 	struct pm8001_hba_info *pm8001_ha;
 	struct pm8001_device *pm8001_dev = dev->lldd_dev;
-	u32 device_id = pm8001_dev->device_id;
+	u32 device_id;
 	pm8001_ha = pm8001_find_ha_by_dev(dev);
 	spin_lock_irqsave(&pm8001_ha->lock, flags);
 	pm8001_tag_alloc(pm8001_ha, &tag);
 	if (pm8001_dev) {
+		device_id = pm8001_dev->device_id;
 		PM8001_DISC_DBG(pm8001_ha,
 			pm8001_printk("found dev[%d:%x] is gone.\n",
 			pm8001_dev->device_id, pm8001_dev->dev_type));
-- 
1.6.6

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