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authorJames Bottomley <James.Bottomley@suse.de>2010-05-13 09:31:54 -0500
committerJames Bottomley <James.Bottomley@suse.de>2010-05-16 15:34:58 -0400
commit1b4d0d8ea7b3cbd107f345ab766416f9b38ce66a (patch)
treea5aeda206eb92e702ad7e9b9e2b91e50fa6964d2 /drivers/scsi/libsas
parentb5dbc858717113c823fe6bb058807c2cb67d1efa (diff)
downloadlinux-1b4d0d8ea7b3cbd107f345ab766416f9b38ce66a.tar.bz2
[SCSI] libsas: fix deref before check in commit 70b25f890ce
commit 70b25f890ce9f0520c64075ce9225a5b020a513e Author: Tejun Heo <tj@kernel.org> Date: Thu Apr 15 09:00:08 2010 +0900 [SCSI] fix locking around blk_abort_request() Introduced a reference before check problem, fix this by moving the lock shorthand code to be right at the point of actual use. Reported-by: Dan Carpenter <error27@gmail.com> Acked-by: Tejun Heo <tj@kernel.org> Cc: Stable Tree <stable@kernel.org> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/libsas')
-rw-r--r--drivers/scsi/libsas/sas_ata.c5
-rw-r--r--drivers/scsi/libsas/sas_scsi_host.c16
2 files changed, 11 insertions, 10 deletions
diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c
index 88f744672576..8c496b56556c 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 completion *waiting;
- unsigned long flags;
/* Bounce SCSI-initiated commands to the SCSI EH */
if (qc->scsicmd) {
+ struct request_queue *q = qc->scsicmd->device->request_queue;
+ unsigned long flags;
+
spin_lock_irqsave(q->queue_lock, flags);
blk_abort_request(qc->scsicmd->request);
spin_unlock_irqrestore(q->queue_lock, flags);
diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 822835055cef..53849f21ad42 100644
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -1030,8 +1030,6 @@ int __sas_task_abort(struct sas_task *task)
void sas_task_abort(struct sas_task *task)
{
struct scsi_cmnd *sc = task->uldd_task;
- struct request_queue *q = sc->device->request_queue;
- unsigned long flags;
/* Escape for libsas internal commands */
if (!sc) {
@@ -1043,13 +1041,15 @@ void sas_task_abort(struct sas_task *task)
if (dev_is_sata(task->dev)) {
sas_ata_task_abort(task);
- return;
- }
+ } else {
+ struct request_queue *q = sc->device->request_queue;
+ unsigned long flags;
- spin_lock_irqsave(q->queue_lock, flags);
- blk_abort_request(sc->request);
- spin_unlock_irqrestore(q->queue_lock, flags);
- scsi_schedule_eh(sc->device->host);
+ spin_lock_irqsave(q->queue_lock, flags);
+ blk_abort_request(sc->request);
+ spin_unlock_irqrestore(q->queue_lock, flags);
+ scsi_schedule_eh(sc->device->host);
+ }
}
int sas_slave_alloc(struct scsi_device *scsi_dev)