Fix mountpoint reference leakage in linkat

Recent changes to retry on ESTALE in linkat
(commit 442e31ca5a49e398351b2954b51f578353fdf210)
introduced a mountpoint reference leak and a small memory
leak in case a filesystem link operation returns ESTALE
which is pretty normal for distributed filesystems like
lustre, nfs and so on.
Free old_path in such a case.

[AV: there was another missing path_put() nearby - on the previous
goto retry]

Signed-off-by: Oleg Drokin: <green@linuxhacker.ru>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 1 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 445d9bbc21eb..d580df2e6804 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3926,10 +3926,13 @@ out_dput:
         done_path_create(&new_path, new_dentry);
         if (delegated_inode) {
                 error = break_deleg_wait(&delegated_inode);
-                if (!error)
+                if (!error) {
+                        path_put(&old_path);
                         goto retry;
+                }
         }
         if (retry_estale(error, how)) {
+                path_put(&old_path);
                 how |= LOOKUP_REVAL;
                 goto retry;
         }