From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 10 Mar 2011 08:44:05 +0000 (-0500)
Subject: ceph: fix d_revalidate oopsen on NFS exports
X-Git-Tag: upstream/snapshot3+hdmi~11294^2~8
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=0eb980e31770cfeff6e27760b4692d595b8dbf28;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

ceph: fix d_revalidate oopsen on NFS exports

can't blindly check nd->flags in ->d_revalidate()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c
index 099a586..ebafa65 100644
--- a/fs/ceph/dir.c
+++ b/fs/ceph/dir.c
@@ -993,7 +993,7 @@ static int ceph_d_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
 	struct inode *dir;
 
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	dir = dentry->d_parent->d_inode;