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
......@@ -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;
......
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