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| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-03 10:15:07 +0100 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2017-05-04 09:19:18 +0200 |
| commit | 805692d0e0f7dec42b5e05fb8b2a5c172f66a3c2 (patch) | |
| tree | c12a31d63fa29a8d5dba953d484b835b25a4b71a /fs/ceph/super.h | |
| parent | ceph: convert ceph_mds_session.s_ref from atomic_t to refcount_t (diff) | |
| download | linux-805692d0e0f7dec42b5e05fb8b2a5c172f66a3c2.tar.xz linux-805692d0e0f7dec42b5e05fb8b2a5c172f66a3c2.zip | |
ceph: convert ceph_cap_snap.nref 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/super.h')
| -rw-r--r-- | fs/ceph/super.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h index fe6b9cfc4013..c68e6a045fb9 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -14,6 +14,7 @@ #include <linux/writeback.h> #include <linux/slab.h> #include <linux/posix_acl.h> +#include <linux/refcount.h> #include <linux/ceph/libceph.h> @@ -162,7 +163,7 @@ struct ceph_cap_flush { * data before flushing the snapped state (tracked here) back to the MDS. */ struct ceph_cap_snap { - atomic_t nref; + refcount_t nref; struct list_head ci_item; struct ceph_cap_flush cap_flush; @@ -191,7 +192,7 @@ struct ceph_cap_snap { static inline void ceph_put_cap_snap(struct ceph_cap_snap *capsnap) { - if (atomic_dec_and_test(&capsnap->nref)) { + if (refcount_dec_and_test(&capsnap->nref)) { if (capsnap->xattr_blob) ceph_buffer_put(capsnap->xattr_blob); kfree(capsnap); |