linux-kernel - [patch] libsas: dereferencing variable before check

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Date:	Thu, 13 May 2010 00:56:29 +0200
From:	Dan Carpenter <error27@...il.com>
To:	"James E.J. Bottomley" <James.Bottomley@...e.de>
Cc:	Tejun Heo <tj@...nel.org>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [patch] libsas: dereferencing variable before check

The "qc->scsicmd" could be null so I moved the dereference inside the
check.  This was introduced by 70b25f890: "[SCSI] fix locking around
blk_abort_request()" 

Signed-off-by: Dan Carpenter <error27@...il.com>

diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 88f7446..98b1545 100644
--- a/drivers/scsi/libsas/sas_ata.c
+++ b/drivers/scsi/libsas/sas_ata.c
@@ -395,12 +395,13 @@ int sas_ata_init_host_and_port(struct domain_device *found_dev,
 void sas_ata_task_abort(struct sas_task *task)
 {
 	struct ata_queued_cmd *qc = task->uldd_task;
-	struct request_queue *q = qc->scsicmd->device->request_queue;
+	struct request_queue *q;
 	struct completion *waiting;
 	unsigned long flags;
 
 	/* Bounce SCSI-initiated commands to the SCSI EH */
 	if (qc->scsicmd) {
+		q = qc->scsicmd->device->request_queue;
 		spin_lock_irqsave(q->queue_lock, flags);
 		blk_abort_request(qc->scsicmd->request);
 		spin_unlock_irqrestore(q->queue_lock, flags);

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