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Diffstat (limited to 'fs/jfs/jfs_mount.c')
-rw-r--r--fs/jfs/jfs_mount.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/fs/jfs/jfs_mount.c b/fs/jfs/jfs_mount.c
index 2935d4c776ec..5d7d7170c03c 100644
--- a/fs/jfs/jfs_mount.c
+++ b/fs/jfs/jfs_mount.c
@@ -37,6 +37,7 @@
#include <linux/fs.h>
#include <linux/buffer_head.h>
#include <linux/blkdev.h>
+#include <linux/log2.h>
#include "jfs_incore.h"
#include "jfs_filsys.h"
@@ -366,6 +367,15 @@ static int chkSuper(struct super_block *sb)
sbi->bsize = bsize;
sbi->l2bsize = le16_to_cpu(j_sb->s_l2bsize);
+ /* check some fields for possible corruption */
+ if (sbi->l2bsize != ilog2((u32)bsize) ||
+ j_sb->pad != 0 ||
+ le32_to_cpu(j_sb->s_state) > FM_STATE_MAX) {
+ rc = -EINVAL;
+ jfs_err("jfs_mount: Mount Failure: superblock is corrupt!");
+ goto out;
+ }
+
/*
* For now, ignore s_pbsize, l2bfactor. All I/O going through buffer
* cache.