linux-kernel - [PATCH] scsi: mvsas: mv_sas.c: Fix for possible null pointer dereference

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Date:	Sun, 18 May 2014 18:12:26 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	"James E.J. Bottomley" <JBottomley@...allels.com>,
	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
Cc:	Jiri Kosina <jkosina@...e.cz>,
	Randy Dunlap <rdunlap@...radead.org>,
	Masanari Iida <standby24x7@...il.com>,
	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] scsi: mvsas: mv_sas.c:  Fix for possible null pointer dereference

There is otherwise a risk of a possible null pointer dereference.

Was largely found by using a static code analysis program called cppcheck.

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/scsi/mvsas/mv_sas.c |   24 ++++++++++++++----------
 1 file changed, 14 insertions(+), 10 deletions(-)

diff --git a/drivers/scsi/mvsas/mv_sas.c b/drivers/scsi/mvsas/mv_sas.c
index 6c1f223..ac52f7c 100644
--- a/drivers/scsi/mvsas/mv_sas.c
+++ b/drivers/scsi/mvsas/mv_sas.c
@@ -1344,19 +1344,23 @@ void mvs_dev_gone_notify(struct domain_device *dev)
 {
 	unsigned long flags = 0;
 	struct mvs_device *mvi_dev = dev->lldd_dev;
-	struct mvs_info *mvi = mvi_dev->mvi_info;
-
-	spin_lock_irqsave(&mvi->lock, flags);
+	struct mvs_info *mvi;
 
-	if (mvi_dev) {
-		mv_dprintk("found dev[%d:%x] is gone.\n",
-			mvi_dev->device_id, mvi_dev->dev_type);
-		mvs_release_task(mvi, dev);
-		mvs_free_reg_set(mvi, mvi_dev);
-		mvs_free_dev(mvi_dev);
-	} else {
+	if (!mvi_dev) {
 		mv_dprintk("found dev has gone.\n");
+		return;
 	}
+
+	mvi = mvi_dev->mvi_info;
+
+	spin_lock_irqsave(&mvi->lock, flags);
+
+	mv_dprintk("found dev[%d:%x] is gone.\n",
+		mvi_dev->device_id, mvi_dev->dev_type);
+	mvs_release_task(mvi, dev);
+	mvs_free_reg_set(mvi, mvi_dev);
+	mvs_free_dev(mvi_dev);
+
 	dev->lldd_dev = NULL;
 	mvi_dev->sas_device = NULL;
 
-- 
1.7.10.4

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