[PATCH 06/23] net, ceph: convert ceph_pagelist.refcnt from atomic_t to refcount_t

[Elena Reshetova]

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.reshet...@intel.com>
Signed-off-by: Hans Liljestrand <ishkam...@gmail.com>
Signed-off-by: Kees Cook <keesc...@chromium.org>
Signed-off-by: David Windsor <dwind...@gmail.com>
---
 fs/ceph/mds_client.c          | 2 +-
 include/linux/ceph/pagelist.h | 6 +++---
 net/ceph/pagelist.c           | 2 +-
 3 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index c681762..7b38e6c 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -1991,7 +1991,7 @@ static struct ceph_msg *create_request_message(struct 
ceph_mds_client *mdsc,
 
        if (req->r_pagelist) {
                struct ceph_pagelist *pagelist = req->r_pagelist;
-               atomic_inc(&pagelist->refcnt);
+               refcount_inc(&pagelist->refcnt);
                ceph_msg_data_add_pagelist(msg, pagelist);
                msg->hdr.data_len = cpu_to_le32(pagelist->length);
        } else {
diff --git a/include/linux/ceph/pagelist.h b/include/linux/ceph/pagelist.h
index 13d71fe..75a7db2 100644
--- a/include/linux/ceph/pagelist.h
+++ b/include/linux/ceph/pagelist.h
@@ -2,7 +2,7 @@
 #define __FS_CEPH_PAGELIST_H
 
 #include <asm/byteorder.h>
-#include <linux/atomic.h>
+#include <linux/refcount.h>
 #include <linux/list.h>
 #include <linux/types.h>
 
@@ -13,7 +13,7 @@ struct ceph_pagelist {
        size_t room;
        struct list_head free_list;
        size_t num_pages_free;
-       atomic_t refcnt;
+       refcount_t refcnt;
 };
 
 struct ceph_pagelist_cursor {
@@ -30,7 +30,7 @@ static inline void ceph_pagelist_init(struct ceph_pagelist 
*pl)
        pl->room = 0;
        INIT_LIST_HEAD(&pl->free_list);
        pl->num_pages_free = 0;
-       atomic_set(&pl->refcnt, 1);
+       refcount_set(&pl->refcnt, 1);
 }
 
 extern void ceph_pagelist_release(struct ceph_pagelist *pl);
diff --git a/net/ceph/pagelist.c b/net/ceph/pagelist.c
index 6864007..ce09f73 100644
--- a/net/ceph/pagelist.c
+++ b/net/ceph/pagelist.c
@@ -16,7 +16,7 @@ static void ceph_pagelist_unmap_tail(struct ceph_pagelist *pl)
 
 void ceph_pagelist_release(struct ceph_pagelist *pl)
 {
-       if (!atomic_dec_and_test(&pl->refcnt))
+       if (!refcount_dec_and_test(&pl->refcnt))
                return;
        ceph_pagelist_unmap_tail(pl);
        while (!list_empty(&pl->head)) {
-- 
2.7.4