From 48f8f711edf3868fe4faa28a19f07acb43532c4a Mon Sep 17 00:00:00 2001
From: Abhi Das <adas@redhat.com>
Date: Wed, 12 Mar 2014 03:41:44 -0500
Subject: [PATCH] GFS2: check NULL return value in gfs2_ok_to_move

gfs2_lookupi() can return NULL if the path to the root is broken by
another rename/rmdir. In this case gfs2_ok_to_move() must check for
this NULL pointer and return error.

Resolves: rhbz#1060246
Signed-off-by: Abhi Das <adas@redhat.com>
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
---
 fs/gfs2/inode.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index ec455b92091f..b52ebf8553c2 100644
--- a/fs/gfs2/inode.c
+++ b/fs/gfs2/inode.c
@@ -1299,6 +1299,10 @@ static int gfs2_ok_to_move(struct gfs2_inode *this, struct gfs2_inode *to)
 		}
 
 		tmp = gfs2_lookupi(dir, &gfs2_qdotdot, 1);
+		if (!tmp) {
+			error = -ENOENT;
+			break;
+		}
 		if (IS_ERR(tmp)) {
 			error = PTR_ERR(tmp);
 			break;