cifs: don't allow cifs_iget to match inodes of the wrong type

If the type is different from what we think it should be, then don't
match the existing inode.

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <sfrench@us.ibm.com>

1 files changed, 5 insertions, 0 deletions

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 2d9cd2f269eb..a15b3a9bbff4 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -724,9 +724,14 @@ cifs_find_inode(struct inode *inode, void *opaque)
 {
         struct cifs_fattr *fattr = (struct cifs_fattr *) opaque;
 
+        /* don't match inode with different uniqueid */
         if (CIFS_I(inode)->uniqueid != fattr->cf_uniqueid)
                 return 0;
 
+        /* don't match inode of different type */
+        if ((inode->i_mode & S_IFMT) != (fattr->cf_mode & S_IFMT))
+                return 0;
+
         /*
          * uh oh -- it's a directory. We can't use it since hardlinked dirs are
          * verboten. Disable serverino and return it as if it were found, the