commit 1f6e4b3f9f7c859fed7ac4c0853e976a1a752873
author Qu Wenruo <quwenruo@cn.fujitsu.com> Tue May 05 10:53:15 2015 +0800
committer Chris Mason <clm@fb.com> Tue Jun 02 19:34:35 2015 -0700
tree fa34f3f76af7b12888fc285cb044fa495d242432
parent 619d8c4ef7c5dd346add55da82c9179cd2e3387e

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>

fs/btrfs/ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 670e4be..9d7a6c38 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -174,7 +174,7 @@
 /* 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