From 8800a044c71a128633cf3febaf4780531a991334 Mon Sep 17 00:00:00 2001 From: Bob Copeland Date: Tue, 6 Jul 2010 11:16:46 -0400 Subject: [PATCH] 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 Signed-off-by: Bob Copeland --- fs/omfs/inode.c | 6 ++++++ fs/omfs/omfs_fs.h | 1 + 2 files changed, 7 insertions(+) diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c index 0af5d0a..579d33f 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 12cca24..ee5e432 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]; -- 2.7.4