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Commit 50682bb4 authored by Eric Sesterhenn's avatar Eric Sesterhenn Committed by Linus Torvalds
Browse files

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: default avatarEric Sesterhenn <snakebyte@gmx.de>
Acked-by: default avatarTigran Aivazian <tigran@aivazian.fsnet.co.uk>

Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus 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;