On Mon, Mar 06, 2017 at 04:21:09PM +0200, Elena Reshetova wrote:

quoted

refcount_t type and corresponding API should be
used instead of atomic_t when the variable is used as
a reference counter. This allows to avoid accidental
refcounter overflows that might lead to use-after-free
situations.

Signed-off-by: Elena Reshetova <redacted>
Signed-off-by: Hans Liljestrand <redacted>
Signed-off-by: Kees Cook <redacted>
Signed-off-by: David Windsor <redacted>

This looks OK to me.

Acked-by: Chris Leech <redacted>

Thank you for review! Do you have a tree that can take this change? 

Best Regards,
Elena.

quoted

---
 drivers/scsi/libiscsi.c        | 8 ++++----
 drivers/scsi/qedi/qedi_iscsi.c | 2 +-
 include/scsi/libiscsi.h        | 3 ++-
 3 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 834d121..7eb1d2c 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c

@@ -516,13 +516,13 @@ static void iscsi_free_task(struct iscsi_task *task)

 void __iscsi_get_task(struct iscsi_task *task)
 {
-	atomic_inc(&task->refcount);
+	refcount_inc(&task->refcount);
 }
 EXPORT_SYMBOL_GPL(__iscsi_get_task);

 void __iscsi_put_task(struct iscsi_task *task)
 {
-	if (atomic_dec_and_test(&task->refcount))
+	if (refcount_dec_and_test(&task->refcount))
 		iscsi_free_task(task);
 }
 EXPORT_SYMBOL_GPL(__iscsi_put_task);

@@ -744,7 +744,7 @@ __iscsi_conn_send_pdu(struct iscsi_conn *conn, struct

iscsi_hdr *hdr,

quoted

 	 * released by the lld when it has transmitted the task for
 	 * pdus we do not expect a response for.
 	 */
-	atomic_set(&task->refcount, 1);
+	refcount_set(&task->refcount, 1);
 	task->conn = conn;
 	task->sc = NULL;
 	INIT_LIST_HEAD(&task->running);

@@ -1616,7 +1616,7 @@ static inline struct iscsi_task *iscsi_alloc_task(struct

iscsi_conn *conn,

quoted

 	sc->SCp.phase = conn->session->age;
 	sc->SCp.ptr = (char *) task;

-	atomic_set(&task->refcount, 1);
+	refcount_set(&task->refcount, 1);
 	task->state = ISCSI_TASK_PENDING;
 	task->conn = conn;
 	task->sc = sc;

diff --git a/drivers/scsi/qedi/qedi_iscsi.c b/drivers/scsi/qedi/qedi_iscsi.c
index b9f79d3..3895bd5 100644
--- a/drivers/scsi/qedi/qedi_iscsi.c
+++ b/drivers/scsi/qedi/qedi_iscsi.c

@@ -1372,7 +1372,7 @@ static void qedi_cleanup_task(struct iscsi_task *task)
 {
 	if (!task->sc || task->state == ISCSI_TASK_PENDING) {
 		QEDI_INFO(NULL, QEDI_LOG_IO, "Returning

ref_cnt=%d\n",

quoted

-			  atomic_read(&task->refcount));
+			  refcount_read(&task->refcount));
 		return;
 	}

diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index b0e275d..24d74b5 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h

@@ -29,6 +29,7 @@
 #include <linux/timer.h>
 #include <linux/workqueue.h>
 #include <linux/kfifo.h>
+#include <linux/refcount.h>
 #include <scsi/iscsi_proto.h>
 #include <scsi/iscsi_if.h>
 #include <scsi/scsi_transport_iscsi.h>

@@ -139,7 +140,7 @@ struct iscsi_task {

 	/* state set/tested under session->lock */
 	int			state;
-	atomic_t		refcount;
+	refcount_t		refcount;
 	struct list_head	running;	/* running cmd list */
 	void			*dd_data;	/*

driver/transport data */

quoted

 };
--
2.7.4

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