[PATCH 3.13 145/149] Fix mountpoint reference leakage in linkat

From: Greg Kroah-Hartman
Date: Thu Mar 20 2014 - 20:05:40 EST

3.13-stable review patch. If anyone has any objections, please let me know.


From: Oleg Drokin <green@xxxxxxxxxxxxxx>

commit d22e6338db7f613dd4f6095c190682fcc519e4b7 upstream.

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@xxxxxxxxxxxxxx>
Signed-off-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

fs/namei.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3945,10 +3945,13 @@ 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);
goto retry;

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