From cba44359d15ac7a3bca2c9199b7ff403d7edc69e Mon Sep 17 00:00:00 2001
From: Marcin Slusarz <marcin.slusarz@gmail.com>
Date: Wed, 13 Feb 2008 15:03:33 -0800
Subject: [PATCH] udf: fix udf_add_free_space

In commit 742ba02a51c8d0bf5446b154531179760c1ed0a2 (udf: create common
function for changing free space counter) by accident I reversed safety
condition which lead to null pointer dereference in case of media error and
wrong counting of free space in normal situation

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Jan Kara <jack@suse.cz>
Acked-by: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 fs/udf/balloc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/udf/balloc.c b/fs/udf/balloc.c
index d721a1a..f855dcb 100644
--- a/fs/udf/balloc.c
+++ b/fs/udf/balloc.c
@@ -145,7 +145,7 @@ static bool udf_add_free_space(struct udf_sb_info *sbi,
 {
 	struct logicalVolIntegrityDesc *lvid;
 
-	if (sbi->s_lvid_bh)
+	if (sbi->s_lvid_bh == NULL)
 		return false;
 
 	lvid = (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data;
-- 
2.7.4