From: Al Viro <viro@zeniv.linux.org.uk>
Date: Thu, 10 Mar 2011 08:44:48 +0000 (-0500)
Subject: gfs2: fix d_revalidate oopsen on NFS exports
X-Git-Tag: firefly_0821_release~7613^2~2275^2~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=53fe924161ff18d24c5c1c256549e9c1b9874827;p=firefly-linux-kernel-4.4.55.git

gfs2: 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/gfs2/dentry.c b/fs/gfs2/dentry.c
index 4a456338b873..0da8da2c991d 100644
--- a/fs/gfs2/dentry.c
+++ b/fs/gfs2/dentry.c
@@ -44,7 +44,7 @@ static int gfs2_drevalidate(struct dentry *dentry, struct nameidata *nd)
 	int error;
 	int had_lock = 0;
 
-	if (nd->flags & LOOKUP_RCU)
+	if (nd && nd->flags & LOOKUP_RCU)
 		return -ECHILD;
 
 	parent = dget_parent(dentry);