From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Tue, 5 May 2015 02:53:15 +0000 (+0800)
Subject: btrfs: Fix superblock csum type check.
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=1f6e4b3f9f7c859fed7ac4c0853e976a1a752873;p=openwrt%2Fstaging%2Fblogic.git

btrfs: Fix superblock csum type check.

Old csum type check is wrong and can't catch csum_type 1(not supported).

Fix it to avoid hostile 0 division.

Reported-by: Lukas Lueg <lukas.lueg@gmail.com>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <clm@fb.com>
---

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 670e4be7225b..9d7a6c38f0b1 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -174,7 +174,7 @@ struct btrfs_ordered_sum;
 /* csum types */
 #define BTRFS_CSUM_TYPE_CRC32	0
 
-static int btrfs_csum_sizes[] = { 4, 0 };
+static int btrfs_csum_sizes[] = { 4 };
 
 /* four bytes for CRC32 */
 #define BTRFS_EMPTY_DIR_SIZE 0