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omfs: refuse to mount if bitmap pointer is obviously wrong

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If the free space bitmap pointer is corrupted such that it lies outside
of the number of blocks in the filesystem, print a message and fail the
mount so the user can fix it offline.

Signed-off-by: Bob Copeland <me@bobcopeland.com>
This commit is contained in:
Bob Copeland 2008-08-14 18:43:59 -04:00
parent f068272cb2
commit 9442e54f43
1 changed files with 9 additions and 0 deletions
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9
fs/omfs/inode.c
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@ -509,6 +509,15 @@ static int omfs_fill_super(struct super_block *sb, void *data, int silent)
goto out_brelse_bh2;
}
if (sbi->s_bitmap_ino != ~0ULL &&
sbi->s_bitmap_ino > sbi->s_num_blocks) {
printk(KERN_ERR "omfs: free space bitmap location is corrupt "
"(%llx, total blocks %llx)\n",
(unsigned long long) sbi->s_bitmap_ino,
(unsigned long long) sbi->s_num_blocks);
goto out_brelse_bh2;
}
ret = omfs_get_imap(sb);
if (ret)
goto out_brelse_bh2;