btrfs: convert btrfs_root.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>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index cdfc2a4..285566c 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1222,7 +1222,7 @@ struct btrfs_root {
        dev_t anon_dev;
 
        spinlock_t root_item_lock;
-       atomic_t refs;
+       refcount_t refs;
 
        struct mutex delalloc_mutex;
        spinlock_t delalloc_lock;

diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index 3748bc5..bd415e1 100644 (file)
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1340,7 +1340,7 @@ static void __setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
        atomic_set(&root->log_writers, 0);
        atomic_set(&root->log_batch, 0);
        atomic_set(&root->orphan_inodes, 0);
-       atomic_set(&root->refs, 1);
+       refcount_set(&root->refs, 1);
        atomic_set(&root->will_be_snapshoted, 0);
        atomic64_set(&root->qgroup_meta_rsv, 0);
        root->log_transid = 0;

diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 2e0ec29..21f1ceb 100644 (file)
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -101,14 +101,14 @@ struct btrfs_root *btrfs_alloc_dummy_root(struct btrfs_fs_info *fs_info);
  */
 static inline struct btrfs_root *btrfs_grab_fs_root(struct btrfs_root *root)
 {
-       if (atomic_inc_not_zero(&root->refs))
+       if (refcount_inc_not_zero(&root->refs))
                return root;
        return NULL;
 }
 
 static inline void btrfs_put_fs_root(struct btrfs_root *root)
 {
-       if (atomic_dec_and_test(&root->refs))
+       if (refcount_dec_and_test(&root->refs))
                kfree(root);
 }