From 50682bb4de35544466c264c017030de826614367 Mon Sep 17 00:00:00 2001 From: Eric Sesterhenn Date: Tue, 6 Jan 2009 14:43:13 -0800 Subject: [PATCH] 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 Acked-by: Tigran Aivazian Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/bfs/inode.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/fs/bfs/inode.c b/fs/bfs/inode.c index 1d2bfafcad7..cc4062d12ca 100644 --- a/fs/bfs/inode.c +++ b/fs/bfs/inode.c @@ -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; -- 2.41.1