[PATCH 07/17] Unionfs: follow_link locking fixes

[Erez Zadok]

Signed-off-by: Erez Zadok <ezk@xxxxxxxxxxxxx>
---
 fs/unionfs/inode.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/unionfs/inode.c b/fs/unionfs/inode.c
index 8d939dc..6377533 100644
--- a/fs/unionfs/inode.c
+++ b/fs/unionfs/inode.c
@@ -820,7 +820,11 @@ static void *unionfs_follow_link(struct dentry *dentry, struct nameidata *nd)
 	err = 0;
 
 out:
-	unionfs_check_dentry(dentry);
+	if (!err) {
+		unionfs_lock_dentry(dentry, UNIONFS_DMUTEX_CHILD);
+		unionfs_check_dentry(dentry);
+		unionfs_unlock_dentry(dentry);
+	}
 	unionfs_check_nd(nd);
 	return ERR_PTR(err);
 }
-- 
1.5.2.2

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