Re: [Xen-devel] [PATCH 2/6] common/gnttab: Correct __acquire_grant_for_copy() fastpath for transitive grants

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 15.08.17 at 14:30, <andrew.cooper3@xxxxxxxxxx> wrote:
> --- a/xen/common/grant_table.c
> +++ b/xen/common/grant_table.c
> @@ -2345,6 +2345,12 @@ __acquire_grant_for_copy(
>           * non-zero refcount and hence a valid owner.
>           */
>          ASSERT(td);
> +
> +        if ( td != rd )
> +        {
> +            ASSERT(td == act->trans_domain);
> +            rcu_lock_domain(td);
> +        }
>      }
>  
>      act->pin += readonly ? GNTPIN_hstr_inc : GNTPIN_hstw_inc;

I think this is superseded by patch 2 of the XSA-226 series just sent.

Jan


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