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authorElena Reshetova <elena.reshetova@intel.com>2017-03-03 11:55:15 +0300
committerDavid Sterba <dsterba@suse.com>2017-04-18 15:07:23 +0300
commit6df8cdf5bda221f268ac23940bce589ad176993d (patch)
treeecf4b8f44ace50682165d8812ccf75c7d802c87f /fs/btrfs/backref.c
parent1e4f4714d59e3fdcde29ee12d40d2e96875a026f (diff)
downloadlinux-6df8cdf5bda221f268ac23940bce589ad176993d.tar.xz
btrfs: convert btrfs_delayed_ref_node.refs 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: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs/btrfs/backref.c')
-rw-r--r--fs/btrfs/backref.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 7699e16784d3..116338344224 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1286,7 +1286,7 @@ again:
head = btrfs_find_delayed_ref_head(delayed_refs, bytenr);
if (head) {
if (!mutex_trylock(&head->mutex)) {
- atomic_inc(&head->node.refs);
+ refcount_inc(&head->node.refs);
spin_unlock(&delayed_refs->lock);
btrfs_release_path(path);