[PATCH v3 22/23] ovl: fix nlink leak in ovl_rename()

[Amir Goldstein <amir73il@gmail.com>]

This patch fixes an overlay inode nlink leak in the case where
ovl_rename() renames over a non-dir.

This is not so critical, because overlay inode doesn't rely on
nlink dropping to zero for inode deletion.

Signed-off-by: Amir Goldstein <amir73il@gmail.com>
---
 fs/overlayfs/dir.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index f87cef27741f..cec89d33ab1e 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -890,6 +890,7 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
 	bool old_opaque;
 	bool new_opaque;
 	bool cleanup_whiteout = false;
+	bool new_drop_nlink = false;
 	bool overwrite = !(flags & RENAME_EXCHANGE);
 	bool is_dir = d_is_dir(old);
 	bool new_is_dir = d_is_dir(new);
@@ -951,6 +952,8 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
 			flags |= RENAME_EXCHANGE;
 			cleanup_whiteout = true;
 		}
+		if (!new_is_dir && new->d_inode)
+			new_drop_nlink = true;
 	}
 
 	old_upperdir = ovl_dentry_upper(old->d_parent);
@@ -1045,6 +1048,9 @@ static int ovl_rename(struct inode *olddir, struct dentry *old,
 	if (cleanup_whiteout)
 		ovl_cleanup(old_upperdir->d_inode, newdentry);
 
+	if (new_drop_nlink)
+		drop_nlink(new->d_inode);
+
 	ovl_dentry_version_inc(old->d_parent);
 	ovl_dentry_version_inc(new->d_parent);
 
-- 
2.7.4