From 9442e54f433eff9b6fbd0836611df4c1919df370 Mon Sep 17 00:00:00 2001 From: Bob Copeland Date: Thu, 14 Aug 2008 18:43:59 -0400 Subject: [PATCH] omfs: refuse to mount if bitmap pointer is obviously wrong 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 --- fs/omfs/inode.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/fs/omfs/inode.c b/fs/omfs/inode.c index bd4bf753a63..0af5d0af9f3 100644 --- a/fs/omfs/inode.c +++ b/fs/omfs/inode.c @@ -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; -- 2.39.5