Re: [PATCH v7 02/22] dma-pool: fix page leak in atomic_pool_expand() cleanup

[Jason Gunthorpe]

On Tue, Jul 14, 2026 at 09:05:25AM +0530, Aneesh Kumar K.V wrote:
> Jason Gunthorpe <jgg@xxxxxxxx> writes:
> 
> > On Wed, Jul 01, 2026 at 11:19:06AM +0530, Aneesh Kumar K.V (Arm) wrote:
> >> @@ -115,8 +116,10 @@ static int atomic_pool_expand(struct gen_pool *pool, size_t pool_size,
> >>  	 */
> >>  	ret = set_memory_decrypted((unsigned long)page_to_virt(page),
> >>  				   1 << order);
> >> -	if (ret)
> >> +	if (ret) {
> >> +		leak_pages = true;
> >>  		goto remove_mapping;
> >> +	}
> >
> > Truely these _set_memory_decrypted() things are an insane API. So a if
> > it fails to decrypt it can be in any messy state?
> >
> 
> Yes, we could possibly try to encrypt the page again and, if that
> succeeds, avoid leaking it. We might want to do that tree-wide in a
> separate patch.

IMHO it is a horrid API if failure leaves thing in an indeterminate
state. For something like this I don't see why the arch FW implementation
would be unable to restore things back to as they were on failure.

But whatever, everything about set_memory_xx is really bad it could
use a cleaning

Jason