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libceph: convert ceph_snap_context.nref 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 14:10:27 +02:00 • committed by Ilya Dryomov
parent 805692d0e0
commit 06dfa96399
2 changed files with 5 additions and 4 deletions
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3
include/linux/ceph/libceph.h
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@ -14,6 +14,7 @@
#include <linux/wait.h>
#include <linux/writeback.h>
#include <linux/slab.h>
#include <linux/refcount.h>
#include <linux/ceph/types.h>
#include <linux/ceph/messenger.h>
@ -161,7 +162,7 @@ struct ceph_client {
* dirtied.
*/
struct ceph_snap_context {
atomic_t nref;
refcount_t nref;
u64 seq;
u32 num_snaps;
u64 snaps[];