[Xen-devel] [PATCH 21/29] drivers, s390: convert fc_fcp_pkt.ref_cnt from atomic_t to refcount_t

[Elena Reshetova <elena.reshetova@xxxxxxxxx>]

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@xxxxxxxxx>
Signed-off-by: Hans Liljestrand <ishkamiel@xxxxxxxxx>
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: David Windsor <dwindsor@xxxxxxxxx>
---
 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 0e67621..a808e8e 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 da5033d..2109844 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;
-- 
2.7.4


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