[PATCH 20/70] cifs: only set ops for inodes in I_NEW state

[Luis Henriques]

3.5.7.14 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Jeff Layton <jlayton at redhat.com>

commit c2b93e0699723700f886ce17bb65ffd771195a6d upstream.

It's generally not safe to reset the inode ops once they've been set. In
the case where the inode was originally thought to be a directory and
then later found to be a DFS referral, this can lead to an oops when we
try to trigger an inode op on it after changing the ops to the blank
referral operations.

Reported-and-Tested-by: Sachin Prabhu <sprabhu at redhat.com>
Signed-off-by: Jeff Layton <jlayton at redhat.com>
Signed-off-by: Steve French <smfrench at gmail.com>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 fs/cifs/inode.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 745da3d..6fbfbdb 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -173,7 +173,8 @@ cifs_fattr_to_inode(struct inode *inode, struct cifs_fattr *fattr)
 
 	if (fattr->cf_flags & CIFS_FATTR_DFS_REFERRAL)
 		inode->i_flags |= S_AUTOMOUNT;
-	cifs_set_ops(inode);
+	if (inode->i_state & I_NEW)
+		cifs_set_ops(inode);
 }
 
 void
-- 
1.8.1.2