Re: [PATCH] hpfs: add checks for ea addresses

[Al Viro]

On Sun, Jul 20, 2025 at 02:34:27PM +0200, Antoni Pokusinski wrote:

>  	ea_end = fnode_end_ea(fnode);
> -	for (ea = fnode_ea(fnode); ea < ea_end; ea = next_ea(ea))
> +	for (ea = fnode_ea(fnode); ea < ea_end && ea_valid_addr(fnode, ea); ea = next_ea(ea))

That looks really fishy.  If nothing else, your ea_valid_addr() is a range check;
are there any situations where we would want to allow fnode_ea() and fnode_end_ea()
be out of that range?