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_bmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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

diff --git a/fs/freevxfs/vxfs_bmap.c b/fs/freevxfs/vxfs_bmap.c
index 2d71128bd8d6..f86fd3cacd5a 100644
--- a/fs/freevxfs/vxfs_bmap.c
+++ b/fs/freevxfs/vxfs_bmap.c
@@ -137,7 +137,7 @@ vxfs_bmap_indir(struct inode *ip, long indir, int size, long block)
 
 		bp = sb_bread(ip->i_sb,
 				indir + (i / VXFS_TYPED_PER_BLOCK(ip->i_sb)));
-		if (!buffer_mapped(bp))
+		if (!bp || !buffer_mapped(bp))
 			return 0;
 
 		typ = ((struct vxfs_typed *)bp->b_data) +
-- 
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