[PATCH 5/5] exofs: Handle error from d_splice_alias()

[Jan Kara <jack@xxxxxxx>]

From: Boaz Harrosh <bharrosh@xxxxxxxxxxx>

When directory hierarchy is corrupted and contains cycles, d_splice_alias() can
fail. Warn user if that happens.

Signed-off-by: Boaz Harrosh <bharrosh@xxxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
 fs/exofs/namei.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/exofs/namei.c b/fs/exofs/namei.c
index fc7161d..6f44d3c 100644
--- a/fs/exofs/namei.c
+++ b/fs/exofs/namei.c
@@ -50,13 +50,17 @@ static struct dentry *exofs_lookup(struct inode *dir, struct dentry *dentry,
 {
 	struct inode *inode;
 	ino_t ino;
+	struct dentry *ret;
 
 	if (dentry->d_name.len > EXOFS_NAME_LEN)
 		return ERR_PTR(-ENAMETOOLONG);
 
 	ino = exofs_inode_by_name(dir, dentry);
 	inode = ino ? exofs_iget(dir->i_sb, ino) : NULL;
-	return d_splice_alias(inode, dentry);
+	ret = d_splice_alias(inode, dentry);
+	if (IS_ERR(ret))
+		EXOFS_ERR("directory #%lu corrupted", dir->i_ino);
+	return ret;
 }
 
 static int exofs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-- 
1.7.1

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