UBUNTU: Ubuntu-4.13.0-45.50

[mirror_ubuntu-artful-kernel.git] / fs / overlayfs / readdir.c

diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index 3d424a51cabbf7f1739f154c4d8a7b5616262029..7920a3f62c1911844edc90ebecd424d20ac27a6b 100644 (file)
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -440,7 +440,7 @@ static int ovl_dir_fsync(struct file *file, loff_t start, loff_t end,
        if (!od->is_upper && OVL_TYPE_UPPER(ovl_path_type(dentry))) {
                struct inode *inode = file_inode(file);
 
-               realfile = lockless_dereference(od->upperfile);
+               realfile = READ_ONCE(od->upperfile);
                if (!realfile) {
                        struct path upperpath;
 
@@ -672,6 +672,7 @@ int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt,
                         struct path *lowerstack, unsigned int numlower)
 {
        int err;
+       struct dentry *index = NULL;
        struct inode *dir = dentry->d_inode;
        struct path path = { .mnt = mnt, .dentry = dentry };
        LIST_HEAD(list);
@@ -690,8 +691,6 @@ int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt,
 
        inode_lock_nested(dir, I_MUTEX_PARENT);
        list_for_each_entry(p, &list, l_node) {
-               struct dentry *index;
-
                if (p->name[0] == '.') {
                        if (p->len == 1)
                                continue;
@@ -701,18 +700,20 @@ int ovl_indexdir_cleanup(struct dentry *dentry, struct vfsmount *mnt,
                index = lookup_one_len(p->name, dentry, p->len);
                if (IS_ERR(index)) {
                        err = PTR_ERR(index);
+                       index = NULL;
                        break;
                }
                err = ovl_verify_index(index, lowerstack, numlower);
-               if (err) {
-                       if (err == -EROFS)
-                               break;
+               /* Cleanup stale and orphan index entries */
+               if (err && (err == -ESTALE || err == -ENOENT))
                        err = ovl_cleanup(dir, index);
-                       if (err)
-                               break;
-               }
+               if (err)
+                       break;
+
                dput(index);
+               index = NULL;
        }
+       dput(index);
        inode_unlock(dir);
 out:
        ovl_cache_free(&list);