f2fs: check the level before calling get_nid function

The caller of get_nid should be careful not to put lower value than
NODE_DIR1_BLOCK in case of level is zero.

Signed-off-by: Changman Lee <cm224.lee@samsung.com>
Reviewed-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 65ec2eabb392..d408e69294c8 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -403,7 +403,8 @@ int get_dnode_of_data(struct dnode_of_data *dn, pgoff_t index, int mode)
                 return PTR_ERR(npage[0]);
 
         parent = npage[0];
-        nids[1] = get_nid(parent, offset[0], true);
+        if (level != 0)
+                nids[1] = get_nid(parent, offset[0], true);
         dn->inode_page = npage[0];
         dn->inode_page_locked = true;