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libceph: convert ceph_osd.o_ref from atomic_t to refcount_t

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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>
This commit is contained in:
Elena Reshetova
2017-03-17 14:10:28 +02:00
committed by Ilya Dryomov
parent 06dfa96399
commit 02113a0f14
2 changed files with 10 additions and 9 deletions
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3
include/linux/ceph/osd_client.h
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@@ -5,6 +5,7 @@
#include <linux/kref.h>
#include <linux/mempool.h>
#include <linux/rbtree.h>
#include <linux/refcount.h>
#include <linux/ceph/types.h>
#include <linux/ceph/osdmap.h>
@@ -27,7 +28,7 @@ typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *);
/* a given osd we're communicating with */
struct ceph_osd {
atomic_t o_ref;
refcount_t o_ref;
struct ceph_osd_client *o_osdc;
int o_osd;
int o_incarnation;