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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>
This commit is contained in:
Bob Copeland 2010-07-06 11:16:46 -04:00
parent 9442e54f43
commit 8800a044c7
2 changed files with 7 additions and 0 deletions
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6
fs/omfs/inode.c
View File

@ -517,6 +517,12 @@ static int omfs_fill_super(struct super_block *sb, void *data, int silent)
(unsigned long long) sbi->s_num_blocks); (unsigned long long) sbi->s_num_blocks);
goto out_brelse_bh2; 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); ret = omfs_get_imap(sb);
if (ret) if (ret)

1
fs/omfs/omfs_fs.h
View File

@ -17,6 +17,7 @@
#define OMFS_EXTENT_CONT 0x40 #define OMFS_EXTENT_CONT 0x40
#define OMFS_XOR_COUNT 19 #define OMFS_XOR_COUNT 19
#define OMFS_MAX_BLOCK_SIZE 8192 #define OMFS_MAX_BLOCK_SIZE 8192
#define OMFS_MAX_CLUSTER_SIZE 8
struct omfs_super_block { struct omfs_super_block {
char s_fill1[256]; char s_fill1[256];