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authorElena Reshetova <elena.reshetova@intel.com>2017-03-03 11:15:06 +0200
committerIlya Dryomov <idryomov@gmail.com>2017-05-04 09:19:18 +0200
commit3997c01d260ed00d712b051fdab022a08719441e (patch)
tree8040eb3b21ee55dcd9a788839a8290be8649cc1d /fs/ceph/mds_client.h
parentd6a3408a77807037872892c2a2034180fcc08d12 (diff)
downloadlinux-3997c01d260ed00d712b051fdab022a08719441e.tar.bz2
ceph: convert ceph_mds_session.s_ref 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> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'fs/ceph/mds_client.h')
-rw-r--r--fs/ceph/mds_client.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index ac0475a2daa7..bbebcd55d79e 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -7,6 +7,7 @@
#include <linux/mutex.h>
#include <linux/rbtree.h>
#include <linux/spinlock.h>
+#include <linux/refcount.h>
#include <linux/ceph/types.h>
#include <linux/ceph/messenger.h>
@@ -156,7 +157,7 @@ struct ceph_mds_session {
unsigned long s_renew_requested; /* last time we sent a renew req */
u64 s_renew_seq;
- atomic_t s_ref;
+ refcount_t s_ref;
struct list_head s_waiting; /* waiting requests */
struct list_head s_unsafe; /* unsafe requests */
};
@@ -373,7 +374,7 @@ __ceph_lookup_mds_session(struct ceph_mds_client *, int mds);
static inline struct ceph_mds_session *
ceph_get_mds_session(struct ceph_mds_session *s)
{
- atomic_inc(&s->s_ref);
+ refcount_inc(&s->s_ref);
return s;
}