From 22c70d1a9c639b432ffdf083bea44752ad9fc8f3 Mon Sep 17 00:00:00 2001
From: Elena Reshetova <elena.reshetova@intel.com>
Date: Thu, 9 Mar 2017 09:44:02 +0200
Subject: [PATCH] scsi: libfc: convert fc_fcp_pkt.ref_cnt from atomic_t to
refcount_t
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 <elena.reshetova@intel.com>
Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: David Windsor <dwindsor@gmail.com>
Acked-by: Johannes Thumshirn <jth@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
---
drivers/scsi/libfc/fc_fcp.c | 6 +++---
include/scsi/libfc.h | 3 ++-
2 files changed, 5 insertions(+), 4 deletions(-)
diff --git a/drivers/scsi/libfc/fc_fcp.c b/drivers/scsi/libfc/fc_fcp.c
index 0e67621477a8a..a808e8ef1d08d 100644
--- a/drivers/scsi/libfc/fc_fcp.c
+++ b/drivers/scsi/libfc/fc_fcp.c
@@ -154,7 +154,7 @@ static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
memset(fsp, 0, sizeof(*fsp));
fsp->lp = lport;
fsp->xfer_ddp = FC_XID_UNKNOWN;
- atomic_set(&fsp->ref_cnt, 1);
+ refcount_set(&fsp->ref_cnt, 1);
init_timer(&fsp->timer);
fsp->timer.data = (unsigned long)fsp;
INIT_LIST_HEAD(&fsp->list);
@@ -175,7 +175,7 @@ static struct fc_fcp_pkt *fc_fcp_pkt_alloc(struct fc_lport *lport, gfp_t gfp)
*/
static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
{
- if (atomic_dec_and_test(&fsp->ref_cnt)) {
+ if (refcount_dec_and_test(&fsp->ref_cnt)) {
struct fc_fcp_internal *si = fc_get_scsi_internal(fsp->lp);
mempool_free(fsp, si->scsi_pkt_pool);
@@ -188,7 +188,7 @@ static void fc_fcp_pkt_release(struct fc_fcp_pkt *fsp)
*/
static void fc_fcp_pkt_hold(struct fc_fcp_pkt *fsp)
{
- atomic_inc(&fsp->ref_cnt);
+ refcount_inc(&fsp->ref_cnt);
}
/**
diff --git a/include/scsi/libfc.h b/include/scsi/libfc.h
index da5033dd8cbca..2109844be53d1 100644
--- a/include/scsi/libfc.h
+++ b/include/scsi/libfc.h
@@ -23,6 +23,7 @@
#include <linux/timer.h>
#include <linux/if.h>
#include <linux/percpu.h>
+#include <linux/refcount.h>
#include <scsi/scsi_transport.h>
#include <scsi/scsi_transport_fc.h>
@@ -321,7 +322,7 @@ struct fc_seq_els_data {
*/
struct fc_fcp_pkt {
spinlock_t scsi_pkt_lock;
- atomic_t ref_cnt;
+ refcount_t ref_cnt;
/* SCSI command and data transfer information */
u32 data_len;
--
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