diff options
Diffstat (limited to 'fs/jfs/jfs_mount.c')
| -rw-r--r-- | fs/jfs/jfs_mount.c | 10 |
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. |