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| author | Bob Copeland <me@bobcopeland.com> | 2010-07-06 11:16:46 -0400 |
|---|---|---|
| committer | Bob Copeland <me@bobcopeland.com> | 2010-07-10 14:38:11 -0400 |
| commit | 8800a044c71a128633cf3febaf4780531a991334 (patch) | |
| tree | b736cdc086d86f27e1b52efa96f2a3f15fe1d443 /fs/omfs | |
| parent | 9442e54f433eff9b6fbd0836611df4c1919df370 (diff) | |
| download | lwn-8800a044c71a128633cf3febaf4780531a991334.tar.gz lwn-8800a044c71a128633cf3febaf4780531a991334.zip | |
omfs: sanity check cluster size
A corrupt filesystem could have a bad cluster size; this could result in
the filesystem allocating too much space for files if too large, or
getting stuck in omfs_allocate_block if too small. The proper range is
1-8 blocks.
Reported-by: Eric Sesterhenn <snakebyte@gmx.de>
Signed-off-by: Bob Copeland <me@bobcopeland.com>
Diffstat (limited to 'fs/omfs')
| -rw-r--r-- | fs/omfs/inode.c | 6 | ||||
| -rw-r--r-- | fs/omfs/omfs_fs.h | 1 |
2 files changed, 7 insertions, 0 deletions
diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c index 0af5d0af9f32..579d33fedddd 100644 --- a/fs/omfs/inode.c +++ b/fs/omfs/inode.c @@ -517,6 +517,12 @@ static int omfs_fill_super(struct super_block *sb, void *data, int silent) (unsigned long long) sbi->s_num_blocks); goto out_brelse_bh2; } + if (sbi->s_clustersize < 1 || + sbi->s_clustersize > OMFS_MAX_CLUSTER_SIZE) { + printk(KERN_ERR "omfs: cluster size out of range (%d)", + sbi->s_clustersize); + goto out_brelse_bh2; + } ret = omfs_get_imap(sb); if (ret) diff --git a/fs/omfs/omfs_fs.h b/fs/omfs/omfs_fs.h index 12cca245d6e8..ee5e4327de92 100644 --- a/fs/omfs/omfs_fs.h +++ b/fs/omfs/omfs_fs.h @@ -17,6 +17,7 @@ #define OMFS_EXTENT_CONT 0x40 #define OMFS_XOR_COUNT 19 #define OMFS_MAX_BLOCK_SIZE 8192 +#define OMFS_MAX_CLUSTER_SIZE 8 struct omfs_super_block { char s_fill1[256]; |