[PATCH 4/5] ext4: Handle error from d_splice_alias()

[Jan Kara <jack@suse.cz>]

When directory hiearchy is corrupted and contains cycles, d_splice_alias() can
fail. Warn user and mark filesystem as with errors when that happens.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/ext4/namei.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index 5845cd9..0cb1a94 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -1317,6 +1317,7 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, stru
 	struct inode *inode;
 	struct ext4_dir_entry_2 *de;
 	struct buffer_head *bh;
+	struct dentry *ret;
 
 	if (dentry->d_name.len > EXT4_NAME_LEN)
 		return ERR_PTR(-ENAMETOOLONG);
@@ -1344,7 +1345,10 @@ static struct dentry *ext4_lookup(struct inode *dir, struct dentry *dentry, stru
 			return ERR_PTR(-EIO);
 		}
 	}
-	return d_splice_alias(inode, dentry);
+	ret = d_splice_alias(inode, dentry);
+	if (IS_ERR(ret))
+		EXT4_ERROR_INODE(dir, "directory corrupted");
+	return ret;
 }
 
 
-- 
1.7.1