Commit 50682bb4 authored Jan 06, 2009 by Eric Sesterhenn Committed by Linus Torvalds Jan 06, 2009

bfs: check that filesystem fits on the blockdevice

Since all sanity checks rely on the validity of s_start which gets only
checked to be smaller than s_end, we should also check if s_end is sane.
Now we also try to retrieve the last block of the filesystem, which is
computed by s_end. If this fails, something is bogus.

Signed-off-by: Eric Sesterhenn <snakebyte@gmx.de>
Acked-by: Tigran Aivazian <tigran@aivazian.fsnet.co.uk>

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent e1f89ec9

fs/bfs/inode.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -390,6 +390,18 @@ static int bfs_fill_super(struct super_block s, void data, int silent)
		- le32_to_cpu(bfs_sb->s_start)) >> BFS_BSIZE_BITS;
		info->si_freei = 0;
		info->si_lf_eblk = 0;

		/* can we read the last block? */
		bh = sb_bread(s, info->si_blocks - 1);
		if (!bh) {
		printf("Last block not available: %lu\n", info->si_blocks - 1);
		iput(inode);
		ret = -EIO;
		kfree(info->si_imap);
		goto out;
		}
		brelse(bh);

		bh = NULL;
		for (i = BFS_ROOT_INO; i <= info->si_lasti; i++) {
		struct bfs_inode *di;