CIFS: Fix ERR_PTR dereference in cifs_get_root

move it to the beginning of the loop.

Signed-off-by: Pavel Shilovsky <piastryyy@gmail.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 6 insertions, 4 deletions

diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index f93eb948d071..54b8f1e7da94 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -548,6 +548,12 @@ cifs_get_root(struct smb_vol *vol, struct super_block *sb)
                 struct inode *dir = dentry->d_inode;
                 struct dentry *child;
 
+                if (!dir) {
+                        dput(dentry);
+                        dentry = ERR_PTR(-ENOENT);
+                        break;
+                }
+
                 /* skip separators */
                 while (*s == sep)
                         s++;
@@ -563,10 +569,6 @@ cifs_get_root(struct smb_vol *vol, struct super_block *sb)
                 mutex_unlock(&dir->i_mutex);
                 dput(dentry);
                 dentry = child;
-                if (!dentry->d_inode) {
-                        dput(dentry);
-                        dentry = ERR_PTR(-ENOENT);
-                }
         } while (!IS_ERR(dentry));
         _FreeXid(xid);
         kfree(full_path);