[PATCH 4/4] Unionfs: ensure we have lower dentries in d_iput

[Erez Zadok]

Signed-off-by: Erez Zadok <ezk@xxxxxxxxxxxxx>
---
 fs/unionfs/dentry.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/fs/unionfs/dentry.c b/fs/unionfs/dentry.c
index d969640..cd15243 100644
--- a/fs/unionfs/dentry.c
+++ b/fs/unionfs/dentry.c
@@ -507,9 +507,10 @@ static void unionfs_d_iput(struct dentry *dentry, struct inode *inode)
 {
 	int bindex, rc;
 
+	BUG_ON(!dentry);
 	unionfs_read_lock(dentry->d_sb, UNIONFS_SMUTEX_CHILD);
 
-	if (dbstart(dentry) < 0)
+	if (!UNIONFS_D(dentry) || dbstart(dentry) < 0)
 		goto drop_lower_inodes;
 	for (bindex = dbstart(dentry); bindex <= dbend(dentry); bindex++) {
 		if (unionfs_lower_mnt_idx(dentry, bindex)) {
-- 
1.5.2.2

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