xen/gnttab: fix gnttabendforeign_access() without page specified
This is an automated ID intended to aid in discovery of potential security vulnerabilities. The actual impact and attack plausibility have not yet been proven. This ID is fixed in Linux Kernel version v5.4.184 by commit 782e5ebcc888003731e6256048c758fc1ab84d3f. For more details please see the references link.