From 82f703bb8cb2732b4437a9f555a1be564e9e71c2 Mon Sep 17 00:00:00 2001
From: Dmitriy Monakhov <dmonakhov@sw.ru>
Date: Tue, 8 May 2007 00:24:34 -0700
Subject: freevxfs: possible null pointer dereference fix

sb_read may return NULL, so let's explicitly check it.

Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org>
Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/freevxfs/vxfs_inode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'fs/freevxfs/vxfs_inode.c')

diff --git a/fs/freevxfs/vxfs_inode.c b/fs/freevxfs/vxfs_inode.c
index 098a915..d1f7c5b 100644
--- a/fs/freevxfs/vxfs_inode.c
+++ b/fs/freevxfs/vxfs_inode.c
@@ -99,7 +99,7 @@ vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
 	offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
 	bp = sb_bread(sbp, block);
 
-	if (buffer_mapped(bp)) {
+	if (bp && buffer_mapped(bp)) {
 		struct vxfs_inode_info	*vip;
 		struct vxfs_dinode	*dip;
 
-- 
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