x86: fix unintended fallthrough case from XSA-154

... and annotate the other deliberate one: Coverity objects otherwise.

Signed-off-by: Andrew Cooper <andrew.cooper3@citrix.com>
One of the two instances was actually a bug.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

diff --git a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
index ee0ddff9c6e97bc80480102b1082aaf27466be9a..ea3f9f2353aade6bf39ae4b3aa4998466e7d7b7e 100644 (file)
--- a/xen/arch/x86/mm.c
+++ b/xen/arch/x86/mm.c
@@ -925,9 +925,11 @@ get_page_from_l1e(
             case 0:
                 break;
             case 1:
-                if ( is_hardware_domain(l1e_owner) )
+                if ( !is_hardware_domain(l1e_owner) )
+                    break;
+                /* fallthrough */
             case -1:
-                    return 0;
+                return 0;
             default:
                 ASSERT_UNREACHABLE();
             }