+ libsas-dereferencing-variable-before-check.patch added to -mm tree

+ libsas-dereferencing-variable-before-check.patch added to -mm tree

[akpm]

The patch titled
     libsas: dereferencing variable before check
has been added to the -mm tree.  Its filename is
     libsas-dereferencing-variable-before-check.patch

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*** Remember to use Documentation/SubmitChecklist when testing your code ***

See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find
out what to do about this

The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/

------------------------------------------------------
Subject: libsas: dereferencing variable before check
From: Dan Carpenter <error27@gmail.com>

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@gmail.com>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 drivers/scsi/libsas/sas_ata.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff -puN drivers/scsi/libsas/sas_ata.c~libsas-dereferencing-variable-before-check drivers/scsi/libsas/sas_ata.c
--- a/drivers/scsi/libsas/sas_ata.c~libsas-dereferencing-variable-before-check
+++ a/drivers/scsi/libsas/sas_ata.c
@@ -395,12 +395,13 @@ int sas_ata_init_host_and_port(struct do
 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);
_

Patches currently in -mm which might be from error27@gmail.com are

linux-next.patch
scsi-remove-superfluous-null-pointer-check-from-scsi_kill_request.patch
libsas-dereferencing-variable-before-check.patch
mm-document-follow_page.patch
include-linux-gfph-spelling-fixes.patch
include-linux-gfph-fix-coding-style.patch
dynamic_debug-small-cleanup-in-ddebug_proc_write.patch
sis-strcpy-=-strlcpy.patch
proc-cleanup-remove-unused-assignments.patch
fs-sysv-dereferencing-err_ptr.patch