linux-kernel - [PATCH 21/29] GFS2: check NULL return value in gfs2_ok_to

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Message-Id: <1396343741-1524-22-git-send-email-swhiteho@redhat.com>
Date:	Tue,  1 Apr 2014 10:15:33 +0100
From:	Steven Whitehouse <swhiteho@...hat.com>
To:	linux-kernel@...r.kernel.org, cluster-devel@...hat.com
Cc:	Abhi Das <adas@...hat.com>, Steven Whitehouse <swhiteho@...hat.com>
Subject: [PATCH 21/29] GFS2: check NULL return value in gfs2_ok_to_move

From: Abhi Das <adas@...hat.com>

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@...hat.com>
Signed-off-by: Steven Whitehouse <swhiteho@...hat.com>

diff --git a/fs/gfs2/inode.c b/fs/gfs2/inode.c
index ec455b9..b52ebf8 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;
-- 
1.8.3.1

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