On Wed 14-09-22 17:47:22, Jan Kara wrote:
> Add sanity check that filesystem size does not exceed the underlying
> device size and that group size is big enough so that metadata can fit
> into it. This avoid trying to mount some crafted filesystems with
> extremely large group counts.
> 
> Reported-by: syzbot+0f2f7e65a3007d39539f@syzkaller.appspotmail.com
> Signed-off-by: Jan Kara <jack@suse.cz>
...
> +	/* At least inode table, bitmaps, and sb have to fit in one group */
> +	if (sbi->s_blocks_per_group <= sbi->s_inodes_per_group + 3) {

Indeed this should have been comparing against number of inode *table
blocks*, not number of inodes... I've fixed the patch locally, the result
is attached for reference.

								Honza
-- 
Jan Kara <jack@suse.com>
SUSE Labs, CR